I wouldn't say the ICBMs are obsolete, any more than an AR-15 is obsolete. They both function as intended. The Minuteman uses a solid booster; can't get more

I wouldn't say the ICBMs are obsolete, any more than an AR-15 is obsolete. They both function as intended. The Minuteman uses a solid booster; can't get more reliable than that. Subs aren't going to get any stealthier. Maybe orbital weapons would give the fastest launch; just drop it. Though they would not be stealthy either. Though I always thought the proposed tunnel network carrying rail based ICBM was kind of cool. In the event of a nuclear apocalypse, it would be a good place for the mole people to live.