Men participate in foreign wars for many reasons, the least of which is that they're frustrated with their own government at home. Many men search for adventure and it isn't much more complicated than that. You can join a mercenary group, join a resistance movement, etc. to fight communism, a dictatorship, to support a communist insurgency, wage Jihad, or carry the Cross into battle. Men throughout time have longed for the excitment of battle. Only the bureaucrats would come up with something along the lines that they're frustrated with their government at home.