It's on Y using M/KB, too.The thing about hotkeys: This game likes to move around the the overwatch key for little good reason. I wish it was always 2.
Mouse and Keyboard controls are very sloppy. However I don't want to learn how to use a controller lol. Tried it once and was annoyed by the lack of hotkeys.
Supposedly B makes them hunker down. It does nothing. I need to try and fix that sometime (bind it to something else entirely, I guess?).