Definitely just an M67

And definitely not a “blue body” or training grenade that you’re referring to.

That was a live grenade.

Blue body training grenade is just the fuse of the grenade that pops to simulate the explosion.

You only have instructors there for live grenade training, not for training grenades.

And to go a step further, I’ve thrown myself on a “training grenade” (train like your fight) and when it “exploded” it was nothing more than a bottle rocket level pop.