Games like Arma 3
Squad
Squad is a large scale combined arms multiplayer first-person shooter emphasizing combat realism through communication, team play, emphasizing strong squad cohesion mechanics as well as larger-scale coordination, tactics, and planning. It features 20 large open maps, vehicle-based combined arms gameplay, and player-constructed bases to create a heart-thumping, visceral gaming experience with split-second decision-making in real-world scale firefights.
Spec Ops: The Line
A third-person shooter in which three American soldiers led by Capt. Walker are sent to Dubai in order to recover whoever remains of an infantry unit, the 33rd Battalion, until they decide to take action against the militants situated in the city. As they progress, however, the logistical and ethical complexity of their objective deepens, and their perception of themselves, and their enemy, is put into question.
Project Reality 2
Project Reality contains some of the deepest cooperative gameplay seen in video games today and is designed to promote both technical realism and teamwork without sacrificing accessibility in doing so. The result is a virtual battlefield that continually proves itself to be both enjoyable and intense to all manner of players, whether they be military enthusiasts or gamers looking to experience an intense and challenging firefight with friends where teamwork is just as important as a quick trigger-finger.
Escape from Tarkov
Escape from Tarkov is a hardcore and realistic online first-person action RPG/Simulator with MMO features and story-driven walkthrough.
Insurgency
Take to the streets for intense close quarters combat, where a team's survival depends upon securing crucial strongholds and destroying enemy supply in this multiplayer and cooperative Source Engine-based experience. The follow-up game to the award-winning Source mod, Insurgency is highly competitive and unforgivingly lethal, striking a balance between one-life gameplay and prolonged action.
Battlefield 2
In Battlefield 2, players will choose to fight for one of three military superpowers: the United States, the Chinese, or the newly formed Middle East Coalition. Armed with the latest modern weaponry, players can take control of any of the game’s 30+ vehicles to engage in major conflicts with over 64 players in some of the largest online battles on the PC. Additionally, persistent character growth allows players to rise through the ranks and attain the ultimate rank of General.
Operation Flashpoint: Dragon Rising
Operation Flashpoint: Dragon Rising is a game about a fictitious conflict on one of the Sakhalin islands, a conflict that is in danger of erupting onto a global scale. The player takes the role of a US soldier, part of the allied force fighting against outnumbering Chinese forces vying for control of the island. The game centers on a campaign narrative that gives the player a variety of roles in the allied forces ranging from a Marine Infantry, tank commander, Special Forces and helicopter captain. The game has an incredible realistic depiction of war with careful attention to the detail of the weapons, equipment and tactics of the armed forces. The action is varied from intense fire fights through to slower pace tactical decision making on how to best tackle the mission objectives.
Breach & Clear
Breach & Clear brings deep tactical strategy simulation to PC, Mac and Linux! Build your Special Operations team, plan and execute advanced missions, and own every angle. Choose your real-world squad -- US Army Rangers, Germany's KSK, Canada’s JTF2, UK SAS, and more -- and take on a variety of foes with different skill-sets and abilities. Learn to approach, engage, and dominate your opponents through superior tactics and training.
Rogue Warrior
Rogue Warrior is a character-driven, first-person-shooter, featuring Richard Demo Dick Marcinko's explosive personality in an action-packed single player campaign, and intense multiplayer combat.
Tom Clancy's Ghost Recon
The Red Army is back. Now that Russia's government has collapsed, a hardline leader is bent on taking over the republics. Enter Ghost Recon, an advanced, futuristic squad of U.S. Army soldiers. Unlike previous Rainbow Six games, the setting is much more focused on the military instead of anti-terrorist maneuvers. Next-generation inventory and weapons will give players a glimpse into the real U.S. Army "Land Warrior" program on which Ghost Recon is based.