WASHINGTON — The Navy’s W93 Mk7 nuclear warhead program achieved Milestone B, authorizing the weapon’s entry into the Engineering and Manufacturing Development phase, on Sept. 24.
The decision represents a critical acquisition checkpoint that moves the United States closer to fielding a modernized warhead for its submarine-launched ballistic missiles, the sea-based leg of the nuclear triad widely considered the most survivable component of American nuclear deterrence.
Milestone B is one of the most significant decision points in the Pentagon’s acquisition process. It authorizes full-scale engineering development and commits substantial funding to move a program from design toward production.
The W93 is intended to equip the Navy’s Trident II D5 submarine-launched ballistic missiles, which are carried aboard Ohio-class and future Columbia-class ballistic missile submarines. The current warhead inventory is aging, and defense officials have argued that modernization is essential to maintaining a credible nuclear deterrent.
The program advances at a time of heightened great-power competition, with both Russia and China expanding and modernizing their own nuclear arsenals. Arms control experts have noted that the simultaneous modernization of nuclear forces by multiple major powers raises questions about strategic stability and the future of arms control agreements.
The National Nuclear Security Administration, the semi-autonomous agency within the Department of Energy responsible for maintaining the U.S. nuclear weapons stockpile, is the lead agency for the W93’s design and eventual production.
The W93 program has received bipartisan support in Congress, with lawmakers on both the House and Senate Armed Services Committees describing submarine-based nuclear modernization as a top national security priority.
The timeline for completing development and beginning production was not specified in the announcement.