I think having a BUG is a must. When my grandfather fought in WWII, he said he used his pistols more than he did his rifles, and he carried his rifle, two pistols, a 1911 and a .32 German Mauser that he took of a dead German (looks like a PP7) and he just did Tac Req and had all the ammo he could ever want for the .32. Then as an absolute fall back, he would use his knife.
He said the fighting was so close, he killed more Germans with the .32 and his knife, than he did his rifle and 1911. Now that's real!