Killer Elite

A former SAS operative is hired to assassinate three of his former teammates, and the plot escalates into a conspiracy involving a secret society of ex-special forces (the Feather Men) and a ruthless Middle Eastern warlord, so action/thriller/crime are the clear genre fit.

Moods reflect the film's gritty, tense, and morally ambiguous tone — it's a revenge-driven plot with a ticking clock and a morally compromised protagonist. The tropes reflect the betrayal at the heart of the plot and the mentor-like bond between the men who were once a team.

No romance or found-family tropes apply here; the relationships are built on shared military history and professional loyalty, not warmth.