Never having served in combat...or near it...I can't speak from personal experience.However,a quote comes to mind regarding bravery in combat.IIRC an Admiral,or Marine General,in assessing the performance of the Marines during one the Pacific battles of WWII (can't recall which one) said something like "in this battle uncommon courage was a common commodity".
IMO...the Army,Navy,Air Force *and * Marine Corps fought skillfully and courageously in WWI,WWII,Korea,Vietnam and the Middle East.
Admiral,or Marine General,in assessing the performance of the Marines during one the Pacific battles of WWII (can’t recall which one) said something like “in this battle uncommon courage was a common commodity”.
“Uncommon Valor Was A common Virtue”..
Chester Nimitz, CINCPAC