Right at the beginning, a couple of resistance fighters are trying to free their comrade from a military stronghold. They spot two of the soldiers making they're way back to base, they then ambush them, knock them out and drag them away.
Then at the 08:20 mark at the resistance base, we see the two soldiers get dragged in before being interrogated by the resistance officer. After getting the answers they need, they eliminate the soldiers and a couple of resistance fighters strip the two soldiers before changing into their uniforms.
https://www.youtube.com/watch?v=dsprglADiSg
P.S. I'm only assuming they are resistance fighters, I could be wrong, so I apologize if I have got it wrong.

