In the non fiction book about USMC sniper; Carlos Hathcock, there is a detailed account of how he & a spotter modified a M2 Browning .50 with a powerful scope to use on a covert op in SE Asia. Hathcock, also called The White Feather would be tasked out by the CIA or MI to track down & smoke-check high value targets.
He shot a NVA(North Vietnam Army) general after waiting 3 days in the jungle with the .50BMG.
I'd add that Major Audie Murphy, the highest decorated soldier of World War II who earned a MoH once said; "There's a thin line between a Medal of Honor & a court martial."
