So you’re 74 and going to wait a few more years ? Before you move to Thailand…
Health insurance will be almost impossible for you to get in Thailand at your age so you’ll need a big cash reserve for any serious visits to a hospital.
An American woman paid over 500,000 bhat for a hip replacement at Bangkok hospital last year
You can apply for marriage visa and Google
Visa agents Hu Hin and most will have prices on their web site
If your discharged from the army and then moved to another country and became a citizen or permanent resident you can join that countries military if they accepted you
Seen good interview with Brit paratrooper who became a member Special Forces in the USA
And any ex soldier can join the French Foreign Legion .