MEMORANDUM FOR SENIOR PENTAGON LEADERSHIP COMMANDANT OF THE COAST GUARD

COMMANDERS OF THE COMBATANT COMMANDS DEFENSE AGENCY AND DOD FIELD ACTIVITY DIRECTORS

SUBJECT: Software Development and Open Source Software

Over the last two decades, open source software (OSS) has dramatically impacted how software is designed, developed, deployed, and operated. OSS is software for which the human­ readable source code is available for use, study, re-use, modification, enhancement, and re­ distribution by the users of such software. There are millions of publicly-available OSS components, libraries, and applications capable of accelerat;ng software modernization activities.

The Department’s 2018 Cyber Strategy (attached) directed the Department to increase the use of secure OSS and to use commercial off-the-shelf tools when possible. The Department’s forthcoming Software Modernization Strategy centers on the delivery of resilient software capability at the speed of relevance. OSS forms the bedrock of the software-defined world and is critical in delivering software faster. The Department must clearly articulate how, where, and when it participates, contributes, and interacts with the broader OSS community.

There are two fundamental concerns for the Department that are specific to OSS. First, using externally maintained code in critical systems potentially creates a path for adversaries to introduce malicious code into DoD systems. This concern requires a careful supply chain risk management (SCRM) approach for OSS, which must meet the same rigorous standards for SCRM and cyber threat testing as any other product. Second, imprudent sharing of code developed for DoD systems potentially benefits adversaries by disclosing key innovations. This risk is managed through a Modular, Open-Systems Approach (MOSA), which allows systems to benefit from OSS while protecting critical, innovative components as separate modules.

Pursuant to Federal Source Code Policy (reference (b)) and Public Law 115-91, Section 875 (reference (c)), Attachment 2 provides detailed guidance on the Department’s participation, contribution, and interaction with the broader OSS community. Additional guidance concerning OSS is available at Open Source Software FAQ. The point of contact for this effort is Dan Risacher.

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