Does anyone have any knowledge or experience around what is required to obtain dual citizenship? More specifically, has anyone ever had to acquire a birth certificate in Thailand.

My situation: I was born in 1973 on a US Army base in Bangkok. I had a US birth certificate but also remember seeing a Thai birth certificate at one point. Both of my parents have passed away and I am looking at the possibility of moving to Thailand to try and connect with my heritage. Anyone else the child of someone from the military? My mother was a Thai native and my father was in the US Army until they brought me to the US in 1974.