Do you know that if you served the Greek army and you get a Turkish nationality afterwards you are excluded from Turkish army duty because you had already served in an "alliance army"?!!!!
The same is valid if you served the Turkish army and then you get the Greek Nationality!!!!!(NATO RULES)/
The same is valid if you served National guard and then you get the Greek nationality (The same,i assume, is valid for T/c army and Turkey) but at least this last has a logic.