Games like Heavy Armored Assassin
Games like Heavy Armored Assassin include Arma 3, Aimlabs, PUBG: BATTLEGROUNDS, Arma Reforger, and KovaaK's. We matched them by the tags players give Heavy Armored Assassin on Steam (Action, Simulation, Strategy, Shooter, and Wargame): closest matches first, and among equally close ones the better-known games.

Arma 3
Shared: Action · Simulation · Shooter

Aimlabs
Shared: Simulation · Action · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · FPS

Arma Reforger
Shared: Simulation · Shooter · Action

KovaaK's
Shared: Action · Simulation · Shooter

WARDOGS
Shared: Action · FPS · Shooter

Hell Let Loose: Vietnam
Shared: Action · Simulation · Strategy

Holdfast: Nations At War
Shared: Shooter · Action · Wargame

Call of Duty®
Shared: Action · Shooter · FPS

Counter-Strike: Source
Shared: Action · Shooter · FPS

Ravenfield
Shared: Shooter · Action · FPS

Squad
Shared: FPS · Shooter · Action

Freeman: Guerrilla Warfare
Shared: Action · Strategy · Shooter

Call to Arms
Shared: Strategy · Action · Shooter

Call of Duty®: Modern Warfare® II
Shared: Action · Shooter · FPS

Battlefield™ 2042
Shared: Shooter · Action · FPS

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Third-Person Shooter

Insurgency
Shared: Action · Shooter · FPS

Arma 2: Operation Arrowhead
Shared: Simulation · Action · Strategy

Verdun
Shared: Shooter · Action · FPS

Hell Let Loose
Shared: Shooter · Action · FPS

Bodycam
Shared: Shooter · FPS · Simulation

Grand Theft Auto V Legacy
Shared: Action · Shooter · First-Person

Zero Hour
Shared: Shooter · Action · FPS