I can see Air Force and Navy officers at any rank in the command structure transitioning (upon proper orders and verification, that is) their troops from their existing billets and specialties to leg infantry if the need were extreme and they were trying to win a war, or just stay alive.
Without fuel to fly aircraft and replacement parts and weapons to maintain and arm them and no real prospects for that situation to change, many Air Force units would not be good for much else at the moment other than to become infantry units or, better yet, assume support positions in the rear so that Army non-combat units can then become leg infantry.
An Air Force general officer or Navy flag officer might have serious reservations about that, as well as tons of operating questions on how to make it all happen, but if the orders were clear and had the proper authority I would think they'd get on board in short order, especially if there was a way to help shorten a nuclear war in the process or ameliorate its effects on civilians they have sworn to protect and defend.
It also stands to reason that at some point in the command structure, AF and Navy officers are given a "What If?" briefing that gives them, in general terms, what's likely to happen in case of nuclear war devastate their bases or (more likely) actions such as electromagnetic pulse that cripple aircraft and ships or shortages of aviation and diesel fuel to propel them. Certainly they don't expect to just be allowed to sit around and twiddle their thumbs and drink coffee while the Army's infantry and mechanized units get overrun in a central European ground war.
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