Majority of people are in a combat zone for about 6mo at a time, and not a lot of them ever end up going at all. I never was selected for any tax exempt duty in

Majority of people are in a combat zone for about 6mo at a time, and not a lot of them ever end up going at all. I never was selected for any tax exempt duty in my 8 years as an enlisted member of the USAF, and anecdotally know a lot of people who over a 4-6 year (usual single enlistment length) career who either only were deployed once or never at all.