It’s still a part of the so-called nuclear triad. Whether it’s actually critical for second-strike credibility (absent a 24/7 in-air alert, which I think no lon

It’s still a part of the so-called nuclear triad. Whether it’s actually critical for second-strike credibility (absent a 24/7 in-air alert, which I think no longer exists?) is up to debate, of course, but that would be the rationale.