Why do most recent Medal of Honor recipients leave the military shortly after being awarded it?

Because the ones that aren’t dead typically have significant injuries that make them nondeployable at best. As somebody else pointed out, most are already medically retired when the revived the MoH.

I'm a United States Marine Corps veteran.
When I was a recruit at MCRD Parris Island S.C. my Battalion Commander with the 2nd Recruit Training Battalion was Lt Col H.C.Barnum Jr. He won the Medal of Honor in Vietnam He retired after 27 years of service. He also is getting a ship hopefully to be sailing sometime around 2022. This is a new class of Navy ship named after Navy and Marine Corps MoH winners. I was proud to have served under him because he set an example for everyone on Parris Island. And he didn't get a White House ceremony when he got the medal so the ship in his name more than made up for that.

What a biased site this censoring someone's comments because it doesn't align with their narrative....and yes my dad served in the military!

I had attending my first Marine Corps birthday pageant as a new butterbar, and I was in line for a piece of cake. In front of me was a broad-shouldered Marine. Someone behind me said, "Major!" The Marine turned, and it was then-Major Wesley Fox, MOH recipient, and now I was looking down at the ribbon on his chest, inches away. Flustered, I turned around, and there was First Sergeant Jimmie Howard. The first sergeant was much taller than me, so now, I'm nose-to-ribbon, staring at his MOH as he talked over my head to Major Fox.

I silently did a left-step, march, forward-march, right-step march to get behind the first sergeant so the two could chat without me in the middle.

Some years later, we did a combined service parachute jump on Tinian that went haywire, and I had several soldiers and one Marine hurt. LtCol Fox was the CO of 1/6, I think it was, and they were on the island. I took the injured to their BAS, and for some reason, a major started reaming me out saying we weren't part of the battalion, and most of my hurt weren't even Marines. LtCol Fox came over and asked us what was going on. When the major told him, the colonel lit into the major, telling him off something fierce. He then escorted us to the the BAS so I could get my men treated.

Anyone who is alive and received the MoH should have died but through the odds survived. Why stay in, you did your duty and lasted when you shouldn't have.

Probably harder to wear than to have received. The actions taken that warranted the award were second nature. Little thought. Now, everything revolves around it. Making sure not to mar the image and so on.