Amanda--yes, I would say you are cynical.
And I usually am too. I was engaged twice to military men before I met the man that is now my husband--and getting engaged did nothing to ensure that our relationship remained strong. It takes work and effort, and in the end me wanting it didn't make things stick. I've come to realize that the military doesn't make people cheat or give up on relationships--the people do.
SthrnZeta--make sure you get a POA (power of attorney) before he leaves, especially if you're getting a house together. Obviously getting a house together is a big sign of a commitment, so you want to make sure that you are protected in case anything happens.
An update from my world--the list of things that-would-only-happen-while-he's-gone continues to grow. Someone hit my car a few weeks ago. I'm fine but it is really making me appreciate how great my spouse is, because he would have taken care of everything and even driven me to get my car when its done.