What is non-taxable combat pay? Where do I find it?

[SteamTrain]

have you been in teh Military recently?

[MaryK1]

If you are an eligible military member who served in a combat zone, your income is not taxed.  However, you can use it as an income source in order to receive the Earned Income Tax Credit. 

A combat zone is an area where U.S. armed forces are engaging in or have engaged in combat AND the area must be designated as a combat zone by a presidential executive order.

Nontaxable combat pay will usually be shown on your W-2, Box 12 with code Q.

See 

Combat Zones Approved for Tax Benefits