DAFMAN91-119 — Safety Design Criteria For Nuclear Weapon Systems Software

DAFMAN91-119 governs safety design criteria for nuclear weapon systems software, including verification independence, coding, testing, and critical functions.

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  • Publication number: DAFMAN91-119
  • Title: SAFETY DESIGN CRITERIA FOR NUCLEAR WEAPON SYSTEMS SOFTWARE
  • Date: 2026-07-15

View DAFMAN91-119 on armypubs.army.mil


DAFMAN91-119 addresses software development, verification organizations, processor design, memory loading, watchdog timers, and integration testing. It requires safeguards for Critical Signals, Safing Commands, non-volatile memory, and passive built-in testing.

Applies to: This guidance is applicable to the US Air Force, Air National Guard, AF Reserve, and US Space Force.

Topics covered

  • Nuclear weapon systems software
  • Verification organization independence
  • Critical Signal processing
  • Safing Command propagation
  • Non-volatile memory loading
  • Hardware watchdog timers
  • Software integration testing

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