Retirement tax questions

Seems like there should be something in box 1...unless ALL of the $$ went into some pretax contribution (like a 401k).....other than the SS and medicare that is.   or maybe it was all Combat pay

...but box 1 is rarely empty....maybe 1 out of 10,000
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*