Here is a response I sent to a guy who asked about the Infantry and officer/NCM stuff.
The way I look at it, the main job of an Infantry Officer is the same at any level and any rank, from Platoon Commander to CO. He is there to set the conditions for the Privates, Corporals and Sergeants to win the battle. Whether it be as a Platoon Commander, where you give tactical direction to your NCOs or as a Battalion staff officer where you do everything in your power to ensure the riflemen are set loose properly, an Infantry Officer is fairly "hands off" when it comes to "trigger time" (or whatever you want to call it). One of my instructors on my Dismounted Platoon Commander Course was a platoon commander who was in Afghanistan and he said he only fired 3 rounds in all the TIC's he was in.
I suspect what you are really looking for is "how often can I look forward to being deployed outside the wire with the troops?" In the Infantry, look to Platoon Commander, LAV Captain, and Recce Platoon Commander as the three big ones below the rank of Major. If you occupy these positions it is then a matter of timing. If your battalion is going overseas, you're the man in the seat, if not, so be it. There are some other positions Army wide that involve time outside (OMLT, etc, etc) but these are outside of the Infantry-specific world. As mentioned, there is more fieldtime available to those inclined to move to CANSOFCOM.
Infantry jobs aside, there is the notion of becoming an officer and if it is what you really want. My advice, don't make your decision simply on whether ROTP can pay your bills. There is enough guys around with commissions that aren't 100% in the game (I'm looking at some right now) and we don't need anymore of them. The troops don't need them either. If you want to spend as much time as you can in the field and like getting your boots muddy, go as an NCM. You'll most likely be deployed every 2 years if you desire to go.
If you feel you have the abilities to stand up infront of 35 soldiers, most with more experience then you, and tell them to "follow me" (which requires the parts to convince them) and if you are willing to accept the additional burdens that this privilege demands (while they're sleeping, you're planning - sleep and command don't usually go together) AND if you're willing to accept that your skills as an Officer will demand your employment in a "hands off, brains on" form, most likely away from the very tip of the spear, then perhaps you should give the Infantry School a shot.
Take it for what it's worth.
Infanteer