Infantry have to put up with being under near-constant threat of death or dismemberment while on patrol.
Pilots have to worry about ground-to-air missiles and stuff.
The navy is probably fine, unless we face a nation with a decent navy. At which point the world is probably 5 kinds of fucked anyway since that'd mean a war between Developed powers.
The MASS PRODUCTION of tools-for-war removed the need for skill in the individual combattent.
Then we went ahead and made them skilled anyway. So, modern soldiers have courage and skill. But in the event of a proper war and not some very basic skirmishing/campaigns? You don't need the skill. people kitted out the same as a professional soldier, taught very basically how to fire the weapon, and given an OFFICERS with skill, will be almost as good as a regular army. And you can crank them out faster. This simply wasn't the case in medieval times, where societies which lived by the bow or sword, pretty much dominated the battlefield until the invention of the crossbow, the prototypical mass-produced tool of war.
So skill isn't reallllly a component of modern warfare as such.
But courage? Definatlely. Especially in the scenario where we need to have a draft again
