Games like Azure Sky Project
Games like Azure Sky Project include Arma 3, Arma Reforger, Door Kickers, Arma 2: Operation Arrowhead, and Police Stories. We matched them by the tags players give Azure Sky Project on Steam (Indie, Action, Strategy, Simulation, and 2D): closest matches first, and among equally close ones the better-known games.

Arma 3
Shared: Action · Military · Simulation

Arma Reforger
Shared: Simulation · Military · Action

Door Kickers
Shared: Strategy · Action · Indie

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

Police Stories
Shared: Action · Strategy · Simulation

WARDOGS
Shared: Action · Military · Tactical

Call to Arms
Shared: Strategy · Action · Military

The Escapists
Shared: Strategy · Indie · 2D

Plague Inc: Evolved
Shared: Strategy · Indie · Simulation

Insurgency
Shared: Action · Tactical · Shooter

Ravenfield
Shared: Action · Military · Shooter

Game Dev Tycoon
Shared: Indie · Simulation · Strategy

Squad
Shared: Military · Action · Shooter

Freeman: Guerrilla Warfare
Shared: Action · Strategy · Shooter

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

Bodycam
Shared: Tactical · Military · Shooter

GROUND BRANCH
Shared: Military · Tactical · Action

Men of War: Assault Squad 2
Shared: Strategy · Action · Simulation

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

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

ShellShock Live
Shared: Strategy · Action · 2D

Insurgency: Sandstorm
Shared: Action · Military · Shooter

Onward
Shared: Shooter · Military · Action

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