I think a lot of people lump two different things together an call it hazing.

Duct taping boots between two matresses and hucking them off the second deck of the bricks: hazing.

Hauling your fireteam off into the treeline in the middle of the night to dig fighting holes because they can't figure out how to properly establish a defense: not hazing.

I've seen both of those happen and called hazing, when (in my opinion) only one was. The point in wearing you down to the bone and stressing you out beyond what you ever thought you could handle is to prepare you for the enemy tries it, except the enemy isn't going to stop. A lot of what I've heard passing as "hazing" now is an attempt to harden some soft boots.

If you can't handle that shit in garrison how are you gonna handle when a 3 day cordon turns into a 7 day op with 3 MREs per person because some cocksuckers thought they could get the drop on you and your boys after seeing you've been up 3 days straight with no resupply in the middle of fucking nowhere miles away from the nearest QRF?