History of Combat Training

Combat Training is a triumph: defeat 300 combatants with Shotguns. The game text says you earn bonus progress in Crucible Ops.

How to complete

Use a Shotgun in any activity that counts combatants and prefer Crucible Ops (a Portal activity) for faster progress. Similar Portal-bonus wording appears on other triumphs; for example Arms Week's "Terribly Modish" gives extra progress in Portal activities (Kyber's Corner).

Unconfirmed: no source I opened describes this triumph directly, so which activities count, its seal or category and its reward are not verified.