I think some cuts to military spending are OK. One of the SECDEF's (Weinberger?) said ANY organization can cut it's budget 5%. The U.S. has historically cut military spending too much, too fast in times of relative peace and that is what I would guard against. Extreme military budget cuts have repeatedly left us vulnerable to exploitation by an enemy, and the enemy repeatedly obliged us with a wakeup call. With today's weapons, such a wakeup call might be difficult to overcome.
The thing we should fear more is the current deficit in military leadership at the GO level, but that's another topic.