"Blue Falcon" is a military slang term used to describe a colleague who betrays or abandons their comrades in a time of need. The phrase is used to criticize individuals who prioritize their own self-interest over the welfare of their comrades. It is often used to describe individuals who, in a situation where they are needed to support or assist their colleagues, instead choose to let them down. The term "Blue Falcon" is a reference to the blue uniform of military police, suggesting that the individual is acting as a "rat" or informant, similar to the role of military police in enforcing discipline and investigating infractions. The phrase is a reminder that in the military, trust, and teamwork are critical for mission success and that individuals who betray their comrades will not be tolerated.