Diamond City security

Diamond City security is a faction acting as the security force that inhabit the interior and exterior of Diamond City. They can often be seen with upgraded baseball bats, reflecting back on Diamond City's former use as a baseball stadium.

Interactions with the player character
The Diamond City guards will engage in combat nearby, even if you are in that zone. The Guards will only attack hostiles, and not you, unless you aggravate them.

Guards often share insightful commentary on areas of the game. They comment on your character when they see through your crouching. (They act much like the guards in Skyrim when it comes to their random commentary.)

Appearances
Diamond City security appears in Fallout 4.

Bugs

 * Diamond City guards will sometimes spawn hostile making it difficult to continue with the storyline. Can be solved by waiting/sleeping for two complete days (24 hours twice)