I had the pleasure of meeting a Nam CH-53 Pilot last year when I was in America. He didn't say to much about it which is understandable. A good friend of his told me he flew Medevac missions in the 53 and was shot down after lifting from the landing site with a full load of injured troops. The Pilot in question was severely injured but recovered from his injuries after 5 months in hospital I believe.
I was lucky enough to fly in his Bell 47 with him before leaving the states. He was impressed with my first go in the 47. Remarkable person!