She knew what she is getting into so why is she mad now?

she has a problem me being in the service, i wasl already in the service when i met her and she didnt have a problem then not she's complaning that i'm never hom and pissed at me for reenlisting, and i do have a somewhat dangerous job but its the air force i got deployed few times and my unit was in the field only 2 times other than the convoys. And i requested anohter tour coz we can really use the money because she is pregnant and that threw her overboard and now not even talking to me when i told her that, but they pay for all that, pay for my school and half of housing why is she complaning when we were dating i kinda explained to her what she was getting her self into, she did get emotional during deployments but the constant nagging is driving me crazy, and also scared that might loose her, what are my options