How do you convince kids to fight and die for you?

Make it prestigious!

A lot of what we see is staged. Rarely were their photographers in the midst of battles. No different than a 500 years of paintings to show us the "wars" of ages old. And the notion of artists being more talented every other generation, or painting more realistically with each new age is another myth.

If the deluge occurred, or as surmised by many peple, multiple deluges have occurred, it is reasonable to say that many of the records found were drawn, written, or recorded by young people who may have survived.

Instead of positioning our ancestors as idiots and know-nothings, it is more likely that young people survived various epochs and did the best they could after each reset.

Being able to easily tell friend from foe was infinitely more important in historical forms of warfare than camouflage.

Perhaps it's not a uniform for killing, but of ridicule. The powers that be compete how silly they can make the plebs looks.

Case in point - the Swiss Guard:

https://i2.wp.com/militaryhistorynow.com/wp-content/uploads/2014/12/swissguard.jpg

I believe it is said the British redcoats wore that color so they couldn’t see the blood on each other when they got shot.

Watch the War Prayer

That has more to do with the adoption of gorilla warfare tactics.

You are an idiot.

At the time weapons couldn't accurately reach far enough to matter. Soldiers would be close enough that what they were wearing wouldn't matter.