Security Clearance Guide
A security clearance is a government-granted authorization to access classified information. There are four main levels — Public Trust, Secret, Top Secret, and TS/SCI — and you must be sponsored by an employer to obtain one.
Most defense and aerospace jobs in Melbourne, Palm Bay, Cape Canaveral, and across the Space Coast require or prefer a security clearance. This guide covers the clearance levels, the application process, and what to expect — plus current job counts for each level.
Last updated: April 2026
Clearance Levels
How to Get a Security Clearance
You cannot apply for a security clearance on your own — an employer must sponsor you. The process involves completing the SF-86 questionnaire, passing a background investigation by DCSA, and receiving adjudication. Timelines range from 2 months (Public Trust) to over a year (TS/SCI).
1. Get Sponsored by an Employer
You cannot apply for a clearance on your own. A defense contractor or government agency must sponsor you, typically after extending a job offer contingent on clearance approval. Many Space Coast employers actively hire candidates who need clearance processing.
2. Complete the SF-86 (e-QIP)
The Standard Form 86 is the backbone of the clearance process. It's an extensive questionnaire covering your personal history: residences, employment, education, foreign contacts, financial records, legal history, and references for the past 7–10 years. Budget several days to complete it accurately.
3. Background Investigation
DCSA (Defense Counterintelligence and Security Agency) conducts the investigation. For Secret clearances, this is primarily records checks. For Top Secret and TS/SCI, expect in-person interviews with your references and possibly a subject interview. The depth of investigation scales with the clearance level.
4. Adjudication
An adjudicator reviews the investigation results and makes a clearance determination based on the 13 adjudicative guidelines (allegiance, foreign influence, financial considerations, etc.). The "whole person" concept means no single factor is automatically disqualifying — context matters.
5. Clearance Granted
Once granted, your clearance is held in DISS (Defense Information System for Security) and can be verified by any cleared employer. You'll need to report life changes (foreign travel, financial issues, arrests) and undergo periodic reinvestigation to maintain it.
The SF-86 in Detail
The Standard Form 86 (SF-86) is a 127-page questionnaire that forms the foundation of every security clearance investigation. It is submitted electronically through e-QIP (Electronic Questionnaires for Investigations Processing). Budget 3–5 days to gather records and complete it accurately — rushing through the SF-86 is one of the most common mistakes applicants make.
Personal Information & Identification
Full legal name (and any former names), date and place of birth, Social Security number, and contact information. If you've changed your name (marriage, legal change), you'll need documentation for each change. Dual citizens must list all citizenships and any foreign passports held.
Residences (Past 10 Years)
Every address where you've lived for the past 10 years, with move-in and move-out dates and a verifier (someone who can confirm you lived there) for each. Tip: check old lease agreements, utility bills, or tax returns to reconstruct exact dates. Gaps of more than 30 days must be explained.
Employment History (Past 10 Years)
Every employer, including part-time and temporary positions, with supervisor names and contact information. Periods of unemployment must be accounted for with an explanation of your activities. Self-employment, freelancing, and military service are all included. Have your old W-2s or LinkedIn profile handy for exact dates.
Education
All schools attended beyond high school, including dates of attendance and degrees received. You do not need to list high school unless it was within the past 10 years. Include trade schools, certificate programs, and military training.
Foreign Contacts & Activities
This section receives heavy scrutiny. List all foreign nationals with whom you have close or continuing contact — including in-laws, college friends, and professional contacts. Report foreign travel, foreign financial interests (bank accounts, property), and any contact with foreign government officials. Thoroughness matters more than minimizing your contacts.
Financial Records
Delinquent debts, bankruptcies, tax liens, judgments, and gambling losses. You must disclose debts that were delinquent for 120+ days in the past 7 years or that are currently 120+ days delinquent. Pull your credit report before starting the SF-86 — surprises here are common and avoidable.
Legal History
All arrests, charges, and convictions — including those that were expunged, sealed, or dismissed. Traffic tickets resulting only in fines (no arrest) generally do not need to be reported. DUIs, drug charges, and domestic violence incidents must be disclosed regardless of outcome.
References
You'll need to provide three references who have known you well for at least the past 7 years. These should be people (not relatives) who can speak to your character, reliability, and trustworthiness. Investigators will contact them and may ask for additional references. Give your references a heads-up that they may be contacted.
Common Disqualifiers and Mitigating Factors
No single issue is automatically disqualifying. Adjudicators apply the "whole person" concept — evaluating the totality of your history, including the circumstances, how recent the behavior was, your age at the time, and evidence of rehabilitation or changed circumstances.
Financial Issues
Financial irresponsibility is the #1 reason for clearance denials. Significant unresolved debt, bankruptcies, tax evasion, or unexplained affluence raise red flags because financial stress can make individuals vulnerable to coercion. Mitigating factors: circumstances beyond your control (medical emergency, job loss, divorce), good-faith efforts to repay debts, financial counseling, and a documented repayment plan. Student loans in good standing are generally not an issue.
Foreign Influence
Close ties to foreign nationals — especially in countries of intelligence concern — can raise questions about divided loyalty. Having foreign family members does not automatically disqualify you, but the nature of the relationship and the country matter. Mitigating factors: the foreign contacts are casual or infrequent, the country is a close U.S. ally, your U.S. ties (property, family, career) are strong, and you report all foreign contacts fully and voluntarily.
Criminal Conduct
Arrests, charges, and convictions — particularly for serious or recent offenses — are scrutinized closely. Pattern behavior (multiple offenses) is more concerning than isolated incidents. Mitigating factors: the offense was minor or isolated, significant time has passed, you were young at the time, you completed all court requirements, and there is clear evidence of rehabilitation.
Drug Involvement
Any illegal drug use, including marijuana (which remains illegal under federal law regardless of state legality), is relevant. Recent use is more concerning than past experimentation. Mitigating factors: the use was infrequent and experimental, significant time has passed (generally 1+ year for marijuana, longer for harder drugs), you've disassociated from drug-using contacts, and there's a demonstrated intent not to use in the future.
Maintaining Your Clearance
Getting a clearance is only the first step — you have ongoing obligations to maintain it. Failing to report life changes or engaging in behavior that raises security concerns can result in suspension or revocation.
Reporting Requirements
You must report significant life changes to your Facility Security Officer (FSO). These include: foreign travel (before you go, when possible), contact with foreign government officials, marriage to or cohabitation with a foreign national, arrests or legal proceedings, significant financial changes (bankruptcy, large unexplained income), and any attempts by foreign entities to recruit or elicit information from you.
Continuous Evaluation (CE)
DCSA has moved from periodic reinvestigations to Continuous Evaluation for most cleared personnel. CE automatically checks your records against government databases — including criminal records, credit reports, and travel data — on an ongoing basis. If CE flags an issue, you may be contacted for clarification or a follow-up investigation. CE supplements but does not fully replace periodic reinvestigations.
Lapsed and Inactive Clearances
If you leave cleared employment, your clearance becomes "inactive" (in the DISS system) rather than revoked. An inactive clearance can be reinstated by a new cleared employer within 24 months without requiring a full reinvestigation — a major advantage when job-hunting. After 24 months, you'll need a new investigation, though your prior clearance history is still considered favorably.
Periodic Reinvestigation
Secret clearances require reinvestigation every 10 years. Top Secret and TS/SCI clearances require reinvestigation every 5 years. Your employer's FSO tracks these timelines and initiates the renewal process. The reinvestigation is similar to the original investigation but typically faster.
Clearance Reciprocity
Clearance reciprocity means that one government agency accepts the clearance investigation conducted by another, avoiding redundant reinvestigations. In practice, reciprocity works smoothly most of the time — but there are important nuances.
DoD-to-DoD Transfers
Transferring a clearance between DoD contractors is straightforward. Your new employer requests a "crossover" in DISS, and the process typically takes 1–4 weeks. Your new FSO verifies your clearance status and "owns" your clearance going forward. This is common on the Space Coast when moving between employers like L3Harris, Northrop Grumman, and Boeing.
DoD to Intelligence Community (IC)
Moving from a DoD clearance to an IC-granted clearance (CIA, NSA, NGA, DIA, etc.) is more complex. While reciprocity is mandated by policy, IC agencies often require additional vetting — including polygraphs that DoD does not typically require. This process can take several months. Going from IC back to DoD is generally faster.
The DISS System
The Defense Information System for Security (DISS) is the central database for all DoD clearances. When you change employers, your clearance record lives in DISS and your new employer can verify and "pick up" your clearance without starting from scratch. FSOs use DISS to manage clearance statuses, initiate investigations, and transfer clearances between facilities.
Which Space Coast Employers Require Which Clearance Levels
Clearance requirements vary by employer and program. Here is a general guide to what the major Space Coast defense employers typically require, based on their contract portfolios and job postings.
| Employer | Typical Clearance Levels | Notes |
|---|---|---|
| L3Harris | Secret, Top Secret, TS/SCI | HQ'd in Melbourne. Wide range of classified programs. |
| Lockheed Martin | Secret, Top Secret, TS/SCI | Major missile defense and space programs. |
| Northrop Grumman | Secret, Top Secret, TS/SCI | Significant Melbourne presence. Many TS/SCI roles. |
| Boeing | Varies (Secret to TS/SCI) | Space and defense divisions. Some uncleared positions. |
| SpaceX | ITAR / Mostly uncleared | U.S. Person required (ITAR). Few cleared positions. |
| Blue Origin | ITAR / Mostly uncleared | U.S. Person required (ITAR). Growing classified work. |
| Collins Aerospace | Secret, Top Secret | RTX subsidiary. Avionics and mission systems. |
| Leonardo DRS | Secret, Top Secret | Defense electronics. Melbourne facility. |
| Leidos | Secret, Top Secret, TS/SCI | IT and mission support. Many cleared positions. |
| United Launch Alliance | Secret, Top Secret | Launch operations at Cape Canaveral. |
Clearance requirements vary by specific role and program. Many employers also have uncleared positions. Check individual job postings for exact requirements.
Frequently Asked Questions
Can I get a security clearance on my own?
No. Security clearances are sponsored by an employer. You must have a job offer or be employed by a company that needs you to have a clearance. The company initiates the clearance process with the government.
Will past marijuana use disqualify me?
Not necessarily. The government evaluates the whole person, including how recent the use was, frequency, and whether you're honest about it on the SF-86. Recent use (within the last year) is more concerning. Honesty is critical — lying on the SF-86 is a federal crime and will disqualify you.
Does bad credit affect my clearance eligibility?
Financial issues are one of the most common reasons for clearance denial. Significant debt, bankruptcies, or financial irresponsibility can raise concerns. However, investigators look at the context — student loans with consistent payments are very different from unexplained spending. Having a plan to address financial issues works in your favor.
Do I need to be a U.S. citizen?
For Secret and above, yes — U.S. citizenship is required. Some Public Trust positions may be available to lawful permanent residents, depending on the agency. Dual citizenship can complicate the process but doesn't automatically disqualify you.
What happens during the background investigation?
Investigators verify your SF-86 information, check criminal records, credit history, and employment records. For Top Secret and above, they conduct in-person interviews with your references, neighbors, coworkers, and sometimes you. They're looking for honesty and reliability, not perfection.
How long does it take to get a clearance?
Timelines vary significantly. Public Trust typically takes 2–6 months, Secret 3–6 months, and Top Secret 6–18 months. TS/SCI with polygraph can take over a year. Many defense employers will start you on unclassified work while your clearance processes.
Can I transfer my clearance to a new employer?
Yes, active clearances can be transferred between employers through a process called a crossover. Your new employer sponsors the transfer, and it typically takes 1–4 weeks. An inactive clearance can be reinstated within 24 months without a full reinvestigation.
What is Continuous Evaluation (CE)?
Continuous Evaluation is an automated system that checks cleared individuals against government databases on an ongoing basis — rather than waiting for periodic reinvestigations every 5 or 10 years. CE monitors criminal records, financial data, and other public records to flag potential security concerns between formal reinvestigations. Most cleared personnel are now enrolled in CE, which supplements but does not fully replace periodic reinvestigations.
Can foreign-born U.S. citizens get a security clearance?
Yes. Naturalized U.S. citizens are eligible for security clearances. However, foreign ties — including family members abroad, foreign financial interests, and dual citizenship — receive additional scrutiny under the 'foreign influence' and 'foreign preference' adjudicative guidelines. Renouncing dual citizenship and demonstrating strong ties to the U.S. can strengthen your case. Many naturalized citizens hold TS/SCI clearances, especially in intelligence and language-specialist roles.
What if I have a gap in my employment history?
Employment gaps are common and do not automatically disqualify you. The SF-86 requires you to account for all periods, including unemployment. Simply explain what you were doing — job searching, caregiving, traveling, education, etc. Investigators are looking for honesty and completeness, not an unbroken employment record. Unexplained gaps raise more concern than documented ones.
How does a polygraph work for clearances?
Polygraphs (lie detector tests) are required for some TS/SCI positions, particularly those involving intelligence agencies (CIA, NSA, DIA). There are two types: counterintelligence (CI) polygraphs focus on espionage and unauthorized disclosures, while full-scope polygraphs also cover lifestyle questions. The examiner asks a series of yes/no questions while monitoring physiological responses. Polygraphs are not required for most Secret or standard Top Secret clearances.
What is an interim clearance?
An interim clearance is a temporary clearance granted before the full background investigation is complete. It allows you to start working on classified material sooner. Interim Secret clearances are commonly granted within a few weeks if your initial records checks come back clean. Interim Top Secret clearances are rarer and take longer. An interim can be revoked if issues surface during the full investigation.
Sources & References
- Defense Counterintelligence and Security Agency (DCSA) — Conducts background investigations for DoD clearances
- SEAD 4: National Security Adjudicative Guidelines — The 13 adjudicative guidelines used for clearance decisions
- 32 CFR Part 147 — Adjudicative Guidelines for Determining Eligibility for Access to Classified Information
- e-QIP (Electronic Questionnaires for Investigations Processing) — OPM's electronic system for completing the SF-86
- Defense Counterintelligence and Security Agency (DCSA) — DISS — Central database for personnel security clearance records