system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] How our military's would do in the guard?

So our planet has after a brief transiting period (with some country s surrendering and others fighting) has been integrated into the Imperium with all the benefits and responsibility that come with it. One of them being that all of the surviving military forces that were not destroyed in the occupation have been formed either into the PDF or into Guard regiments to be sent off to some distant war-zones. Really what I wanted to know was what with all the enemy's the Imperials say are out there, what are the chances for our boys being sent out into these new wars? (meta - the question really is how would our real life modern military forces would fare in the 40k setting).
gpt
Pretty much the same as most other guard regiments. The scale at which guard regiments are deployed makes individual skill relatively useless most of the time.

Sure the Catachans are excellent jungle fighters and the Tanith are great stealth troops. But most of the time the war zones are so big that guard are simply deployed by the numbers with no regard for their talents or skills.

When Earth pays it's tithe of men out of our current armed forces it'll hardly matter if a man is a navy seal or some gulag prisoner. Guardsmen are bodies with lasguns and that's pretty much it.

The imperium doesn't care if a planet's tithe of men consists of highly trained soldiers, savages who'd never seen technology beyond a spear until they were conscripted or sacrificial prisoners.

They'll all get basic training, a lasgun and a one way ticket to the suck.