I certainly can't beat that today...but between 1966 and 1969, I could at least equal it.
Living out in the jungle...sometimes if lucky in a sandbagged hootch, eating local produce (with the ever present threat of dysentary) and C-rats, humidity of 100%, temp of 96 to 98 degrees, constant rain for 6 months at a time, mold, bad water, no mail of any kind (we never even heard of "e-mail"), flak jackets (if the First Shirt or CO was around), jungle boots, a buddy you didn't know if you could trust, jungle rot, and for us E-1s, a total of $37 every two weeks that was lost within a day or two of payday in various and sundry poker games.
So...thank him for his service from all of us....but especially from us vets. Tell him we know a bit about what he's going through.
Hugs.