Games like Operation Valor
Games like Operation Valor include Counter-Strike 2, Tom Clancy's Rainbow Six Siege, Squad, WARDOGS, and Arma 3. We matched them by the tags players give Operation Valor on Steam (Top-Down Shooter, Multiplayer, Action, Tactical, and PvE): closest matches first, and among equally close ones the better-known games.

Counter-Strike 2
Shared: Multiplayer · Action · Shooter

Tom Clancy's Rainbow Six Siege
Shared: Multiplayer · PvP · Tactical

Squad
Shared: Multiplayer · PvE · PvP

WARDOGS
Shared: Multiplayer · Action · Tactical

Arma 3
Shared: Multiplayer · Action · Military

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

BattleBit Remastered
Shared: Multiplayer · Shooter · Action

Battlefield™ 2042
Shared: Multiplayer · Action · Shooter

Call of Duty®
Shared: Multiplayer · Action · Shooter

PUBG: BATTLEGROUNDS
Shared: Multiplayer · Shooter · Action

Battlefield™ 6
Shared: Multiplayer · Action · Shooter

Insurgency
Shared: Multiplayer · Tactical · Action

RUNNING WITH RIFLES
Shared: Top-Down Shooter · Action · Tactical

Counter-Strike
Shared: Action · Multiplayer · Shooter

Insurgency: Sandstorm
Shared: Multiplayer · Tactical · Action

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

Apex Legends™
Shared: Multiplayer · Action · Shooter

World of Warships
Shared: Multiplayer · Shooter · PvP

Call to Arms
Shared: Action · Multiplayer · Military

Battlefield 4™
Shared: Multiplayer · Action · Shooter

Arma 2: Operation Arrowhead
Shared: Action · Multiplayer · Tactical

Hell Let Loose
Shared: Multiplayer · Shooter · Action

Bodycam
Shared: Multiplayer · Tactical · Shooter

Arma Reforger
Shared: Action · Multiplayer · Shooter