Is a sign-on bonus installment tax free if it was received while in Kuwait?

I’m really not sure. I thought not but to use the savings deposit program you are suppose to be in a combat zone and I thought Kuwait wasn’t considered a combat zone so I waited till I arrived in KSA to set it up but they backdated it to the day I arrived in Kuwait and told me it’s considered a combat zone for the savings deposit program. Really confusing bc I didn’t receive any extra payments or IDF while in Kuwait.

I got a sign on bonus and one of the installments will be received while in Kuwait and I did get tax credits on my LES while in Kuwait. So I’m wondering if I’ll get my tax credits for my bonus also or if it will just be tax since it was my sign on bonus that I signed for stateside when I first enlisted.