If your old enough to fight and die for this country your old enough to carry a concealed handgun, PERIOD.
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The same argument could apply to the drinking age also.
Let me play devils advocate on this without consideration of what my real feeling are but just for the sake of argument.
18 year old's in the military have gone through boot camp to weed out the weak and the nuts (some of them), they are trained to use a weapon and they have a hierarchy guiding and ordering their actions with that weapon, the average 18 YO who would be affected is only guided by what the law considers a legal purchaser. Is there a difference between those two 18 YO examples? you tell me?