realistically, there's no such thing as an adult male civilian. if india got into a war with china, all adult males would be targeted. you can cry, "civilian!" all day, but you'll be ignored. there's also the issue of cowards. if you leave the door open to leaving the military, a lot of people will simply leave out of cowardice, especially when morale is low. that's why barrier troops exist. in general, desertion is treated as a crime everywhere. even your gita is telling someone not to desert the military.
Muslim