Oh I see, No it's not handy for a surgeon to be afraid of blood.
And a soldier, I agree also, you should be able as a soldier to, harrass and torture people on command, so I agree on the aggression part but as a soldier that is bombing innocent people from a plane or from behind a video screen to "protect your country" , shooting depleted uranium rockets (irak bosnia) on your peace missions and to spread democracy, etc. there the aggression part is not so important then we (the country) are more served by your ability to put your own moral compass aside to say " I just follow orders I just do my job" or a policeman "I don't make the law I just enforce it, So I agree on the aggression part, but ability to blindly obey orders is more important i.m.h.o. or else you get not very useable soldiers, and get what you have now with the american soldiers where there are more soldier killing themselves than that are killed in the war.
The age thing I also agree.
Cheers.
Edited some mistakes and added
Thanks for adding the importance of "blindly obey orders" ability for a "good" soldier. The things that you've described are horrible and unfortunately true.