DC10, based on what I'm reading here, I suggest you avoid the military all together.
The military is an ends to itself...not a means to get to an airline job. If you desire to serve your country as a military officer, then go for it -- it will be a tough enough path just getting commissioned that if you don't really want it you will either see the time/effort as wasted or you won't make it in the first place.
If you ARE interested in becoming a military officer (who has a job as a pilot on the side), and are willing to accept all of the baggage that comes along with being a military officer (the moves, the "needs of the service", the deployments away from home), then you SHOULD not care what path you take to getting commissioned (as in, ROTC is as good of an option as OCS/OTS and USAFA).
In the USAF, at least, it is a 6-year commitment just to be commissioned as an officer, and a 10+ year commitment if you are selected to be a pilot and make it through training. That's 10 years of service even if you are not flying an airplane.
It is NOT a decision to be made lightly.
So, if your ultimate goal is just to become an airline pilot, then I suggest you pass up going the military route.