hitman (game)
Stealth video game franchise developed by Danish game developer IO Interactive and formerly published by Eidos (until 2009) and Square Enix (until 2017).
The series follows Agent 47, a cloned assassin-for-hire, whose flawless record places him in high demand among the wealthy and elite around the world.
The game is about assassinating your targets, either by precise assassinations or mass murdering, although the game rewards you more if you do the precise assassination route.
In Girls' Frontline, WA2000's suit is a reference to Agent 47, who carries a WA2000 as his trademark sniper rifle.