[NorthMountain]

To add insult to injury, after we all did our practice throws on the grenade range using the awkward shotput technique, the drill instructors started lobbing out some extra grenades by throwing them like baseballs.

They trained you "by the book", in compliance with their orders. Then they showed you how it's done in the real world.

[Carlucci]

My son qualified “expert” in hand grenades in basic. I mused that a lifetime of video games had prepared him for that.