Since you were vague about "a memory from a mission" I picked one arbitrarily, haha. In case you need clips I am linking them here:

Grenade blast scene - Important details to know - though York's two teammates, both in white armor, are using live ammunition, York and their opponent Texas only have armor-hardening paint rounds in their weapons. This is the pink foamy type stuff you can see Texas shooting at them. (You get even more context if you watch the whole episode, but it's not really necessary.)

York insists on running infiltration despite his injury - pretty self-explanatory, haha. Here you see his cocky attitude show through as well as his relationship to Carolina.