Army service in that condition can be best clarified through Turkish Consulates in the US. He can get the best suggestion from there.

As an explanation in similar conditions, even if someone over-aged 40s, somehow deferred or delayed military service. The reasons should be questioned as well as his health condition should be checked by the official procedure.

For your knowledge, in general, someone aged over 50s will have some natural health problems which will cause another procedure to dismiss the military obligation because of health problems.

Also for dual citizens and Turkish workers abroad, there are certain rules to complete the national service untill the age of 40s. If not hte citizenship might be cancelled. And another procedure has to be followed, to regain the citizenship rights.

But, I repeat, the best address in your friends situation is the nearest Turkish Consulate in the US. His charges in the may only affect *I guess* if it prevents him to go abroad....