It's especially dumb in that no one in the NCR can deal with 4 Fiends out in the open on roof with clear sight lines all around and a few mines and traps around the body? That's what is so daunting that they simply can't handle it and warn you off as a suicide mission if you attempt it?
I talked with the NCR soldiers at the sandbags, got the warning, walked a few steps and to get a slightly better angle on the roofs. Crouched down and 4 shots later from my trusty Hunting Rifle the remains of their heads were littering the ground behind the building their corpses were now resting on top of. Thanks for the shotgun ammo and XP from your "deadly" traps as well, dead Fiends.
Rather pathetic showing from the NCR, to be honest.
There were more like 7 Fiends, all with Hunting Rifles that always hit you, no matter what... I had quite a hard time. But really, from that small NCR camp any half decent sniper would be able to pick a few off, so I see what you mean.
I was disappointed with the reward as well. OMG NCR reputation. Yay.