I'll pick one nobody else is likely to pick, Mad Jack Churchill.
He heard they were forming a commando unit, and he signed up just because he thought it sounded cool. He actually went into battle with a longbow (He did actually use it with success) and a claymore (The basket-hilt broadsword variant, not the two-handed one) and bagpipes. At Dunkirk, when the ramps on his landing craft fell, he ran forward playing "March of the Cameron Men" and throwing a grenade. His unit was almost wiped out by Germans, and he didn't run, he sat there and played "Will Ye No Come Back Again" on his bagpipes. He was captured by the Germans, escaped, captured again, and escaped again.
After World War II, he was in Israel and he helped coordinate the evacuation of 700 doctors and staff from an Israeli hospital and attempted to assist a medical convoy that was attacked by hundreds of Arabs.
After than, he became the first man to surf on the River Severn's tidal bore, and every day returning from home, he would startle passengers and conductors on the train by hurling his briefcase through a window. He later explained he was throwing it into his backyard so he didn't have to carry it home.
Here's a picture of him leading the charge with his sword. (He's on the far right, near the lower corner)
http://upload.wikimedia.org/wikipedia/commons/d/d2/Jack_Churchill_leading_training_charge_with_sword.jpg