Foolhardiness, bravery or stupidity.
I am totally amazed that even a cretin from TSA could demand the nail clippers from a combat-trained soldier, who is as fit as a butcher's dog, is on his way home after months of deprivation and being targeted by some really nasty folks, is tired and grumpy after his flight has been needlessly delayed, has testosterone coming out of his armpits and has a 3 feet long metal club in his hands. The TSA idiot was lucky to survive the encounter.