https://taskandpurpose.com/air-force-joint-base-andrews-incels-threat-brief :
At least one Air Force base is on the lookout for a sinister new threat: angry men who can't get laid.

Personnel at Joint Base Andrews in Maryland were recently treated to a threat brief regarding an "increase in nationwide activity" by self-described "incels," members of an online subculture of "involuntary celibacy" who adopt an ideology of misogyny, mistrust of women, and violence in response to their failed attempts at romantic relationships.