I'd say that if that helps bring a measure of comfort for pops, geeve em!
Im not sure about which branch your son's with, but anykind of training is good training. Great job for being there for him; I also have 2 hanai/step sons, one is an Army/Afghan vet, getting ready to go again in 4 mos.
My son left with the rest of his 1/3 Lava Dogs last month; his 2nd tour to Helmand Provence. My dad is a Marine vet, I'm a Marine vet, and now my oldest son is out there for God, Corps and Country. We've all been through this. Since I live in Hilo, I flew over to spend the last few days with him, his wife and my moo'puna...anyway, he and I spent some good times wala'au, shared thoughts and exchanged gifts.
The Corps is very tight about bringing personal gear so we honored that. He soooo wanted to take my Taurus PT 1911 with him.
Anyway, best of luck to your son; I'll keep him in my Prayers.
Aloha, Sgt.C
Frank