It doesn't seem that there are many software development positions (which is relevant for many users here) in the (assuming US) army or military in general.
I imagine the signals or intelligence corps will take you in a heart beat providing you don’t have a history of mental illness or some other condition that disallows entry such as autism. They were even contemplating lowering the fitness test requirements for devs because they were that desperate to recruit. At least that’s what I heard over here in the UK about our military. I thought about joining long and hard but ultimately decided it wasn’t for me.
The Space Force is hiring devs and data scientists.[1] What they mostly do, after all, is collect huge amounts of data from various sensors and try to make sense of it. With college and engineering training, go for an officer position.[2]