Surviving the Cut

US Army Ranger School candidates sleep little and eat less while running 20-hour missions.

Only nine out of 100 candidates will survive "Extended Training Day."

The 12-week recon course is a man-breaking, all-out endurance test meant to forge top soldiers.

Elite special ops soldiers, many Army Rangers and Green Berets, push their bodies to the limit.

Navy specialists must go through a five-day series of high-stress missions.

Even though only the best Marines even make it to the sniper course, one in three will fail.