Looking for half sister, adopted into a military family in NM? Currently in military?

I am searching for my half-sister. I really know nothing about her except for my mother's name. She was born in Albuquerque, NM and born before 1982. She contacted my mother a few years back, but since my and my mother's relationship is strained, I have not received any current information. Last thing I heard, my sister was married to a man in the military and she was in Germany. I believe she was also adopted by a couple who were in the military. Please help!!!! Mom's last name is Trego