I am in the military , active duty , and so is my spouse. I am trying to get a green card for my father and needed to know the process or if possible

OK so if you are a United States citizen and Dad entered the United States legally with a visa, then you can sponsor him to get a green card without him returning to his country. The process takes about a year from the time that you file until the interview date.   If Dad is overseas, you can still sponsor him but he would process overseas at the US consulate and that is taking a little bit longer. It does not matter if you are married, as you can still sponsor your father for a green card. You should retain counsel to process the case from start to finish. Some of us charge an affordable flat fee for these type of cases and remain in the case for its lifespan.