I was giving a choice to purchase a Gold Perk and a Silver Perk.
I already bought a Gold Perk for Killing 5 generals, I'm not sure if I made the right decision purchasing that one, but it does seems harder to kill the Generals whenever I get close they know even when I'm wearing a Nazi uniform.
I have a Silver Perk left to purchase, which one do you guys have the most trouble with?
And will I get more of Gold Perks in the black market? or is it a one time thing only

I've noticed that I do need all the Gold Perks to get a trophy
Thanks