Comment:  Some recent reporting about maintaining second strike capability.

https://www.defense.gov/News/News-Stories/Article/Article/3786326/us-needs-sea-based-nuclear-capability-to-ensure-second-strike-capability/

Quote:

In a nuclear conflict where adversaries launch a first strike, it's possible they might render U.S. ground-based and air-launched systems unusable. But the U.S. still maintains deterrence though sea-based systems, which guarantee a second-strike capability— the ability to strike back. 

"If you think about it from the adversary's perspective, anything that they may think they could do as an initial strike, that [ballistic missile submarine] force is always out there on alert, on patrol, unknown where they're at," said Navy Vice Adm. Johnny R. Wolfe Jr., director for strategic systems. "Certainly, if ever called upon, they are survivable and could ensure that a second-strike from our nation could be performed. That is absolutely critical, as you look at deterrence and what it means." 

Wolfe, along with Air Force Gen. Thomas A. Bussiere, commander of Air Force Global Strike Command, testified Wednesday before the Senate Armed Services strategic forces subcommittee.

Quote:

The DOD's fiscal year 2025 budget request includes $49.2 billion to modernize the department’s nuclear triad. Included in the request are investments for the Columbia-class ballistic missile submarine, the B-21 bomber and the Sentinel system, which is a modernization for the ground-based portion of the nuclear triad.