What Does Defense Security Service Do?

Total employees725
HeadquartersQuantico
Founded1971

The Defense Counterintelligence and Security Agency (DCSA) is America's premier security agency, safeguarding the nation by serving as the primary entity for conducting background investigations for federal security clearances. DCSA also provides counterintelligence, insider threat, and security training services to the U.S. government and its contractors. Its mission is critical to protecting national security information, personnel, and facilities. DCSA was established in 2019, evolving from the former Defense Security Service (DSS) and consolidating other security functions.

Where Is Defense Security Service's Headquarters?

HQ Function

Serves as the central command and administrative center for DCSA's nationwide operations, overseeing policy development, strategic planning, and resource management for security clearances, counterintelligence, and industrial security.

Notable Features:

Located within a secure military installation, co-located with other key federal agencies, facilitating inter-agency collaboration. The Russell-Knox Building is a modern facility designed for secure operations.

Work Culture:

A mission-driven environment focused on national security, professionalism, integrity, and continuous improvement. Employees are dedicated public servants committed to protecting sensitive information and supporting the U.S. defense industrial base.

HQ Significance:

The HQ is pivotal for orchestrating DCSA's critical mission of adjudicating security clearances for millions of federal employees and contractors, and overseeing the security of classified information held by industry.

Values Reflected in HQ: Security, integrity, collaboration, and service to the nation are reflected in the secure location, operational focus, and inter-agency partnerships fostered at the headquarters.

Location:

While DCSA's primary operations are within the United States, its mission has global implications. DCSA supports U.S. national security interests worldwide by vetting personnel assigned to overseas posts, working with international partners on security standards, and protecting classified information shared with allied nations and cleared U.S. contractors operating internationally. It also conducts background investigations on individuals who have lived or worked abroad, and provides security oversight for U.S. industry operating overseas under U.S. government contracts.

Street Address:

27130 Telegraph Rd

City:

Quantico

State/Province:

Virginia

Country:

USA

Where Else Does Defense Security Service Operate Around the World?

Fort Meade, Maryland, USA

Address: Specific street addresses for DCSA field offices are generally not publicized for security reasons. Operations are often co-located on military bases or secure federal facilities.

To provide localized and responsive security services, manage field investigators, and engage directly with facilities and personnel requiring DCSA support within its designated geographic area.

Various Locations, Nationwide, USA

Address: Multiple field offices and operational sites strategically located across the United States to support mission requirements.

Ensuring comprehensive national coverage for background investigations, continuous vetting, industrial security inspections, and counterintelligence activities.

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Notable news
Hiring actively
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*Example signal, not calculated in real time

Who's Leading Defense Security Service? Meet the Executive Team

As of April 2025, Defense Security Service' leadership includes:

William K. Lietzau - Director
Daniel J. Lecce - Deputy Director
Heather L. Green - Principal Deputy Director
Jennifer L. Gannon - Chief of Staff

Who's Investing in Defense Security Service?

Defense Security Service has been backed by several prominent investors over the years, including:

U.S. Government Appropriations (Funded by Taxpayers)

What Leadership Changes Has Defense Security Service Seen Recently?

Hire0
Exits0

No major publicly announced changes at the Director or Deputy Director level for the Defense Counterintelligence and Security Agency (DCSA) in the past 12 months. Senior Executive Service (SES) appointments and reassignments occur as part of regular agency operations but are not typically highlighted as major 'executive news' in the same vein as publicly traded companies. Therefore, the specific counts for top executive hires and exits are reported as 0.

What Technology (Tech Stack) Is Used byDefense Security Service?

Discover the tools Defense Security Service uses. Highperformr reveals the technologies powering your target accounts — helping your sales, marketing, and GTM teams prioritize smarter and close faster.

Defense Security Service Email Formats and Examples

Email addresses at the Defense Counterintelligence and Security Agency (DCSA) typically follow a standard U.S. government format, commonly using the '@dcsa.mil' domain. The most prevalent patterns are variations of first name and last name.

Common formats include [first].[last]@dcsa.mil or [firstinitial][lastname]@dcsa.mil. For example, john.doe@dcsa.mil or jdoe@dcsa.mil.

Format

jane.doe@dcsa.mil

Example

75%

Success rate

What's the Latest News About Defense Security Service?

DCSA News - dcsa.milMay 8, 2024

Defense Counterintelligence and Security Agency (DCSA) Hosts National Center for Credibility Assessment Research Symposium

DCSA's National Center for Credibility Assessment (NCCA) recently hosted a research symposium, bringing together experts to discuss advancements and challenges in credibility assessment technologies and methodologies, crucial for national security vetting....more

DCSA News - dcsa.milApril 16, 2024

Defense Counterintelligence and Security Agency (DCSA) Vetting Risk Operations sets new CUI marking policy

DCSA's Vetting Risk Operations (VRO) announced a new policy for marking Controlled Unclassified Information (CUI), aiming to standardize practices and enhance the protection of sensitive but unclassified government information across the agency and its stakeholders....more

DCSA News - dcsa.milMarch 21, 2024

Defense Counterintelligence and Security Agency (DCSA) helps identify vulnerabilities that could impact DoD supply chain

DCSA is actively involved in identifying and mitigating vulnerabilities within the Department of Defense supply chain through its industrial security assessments and partnerships, enhancing the resilience of the defense industrial base against foreign threats....more

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