Logistics (moving trucks with supply, building FOBs, resupplying troops, etc) are essential in Squad. It's a multiplayer action game and the closer that I got to "I feel like I'm in a modern combat and suffering from PTSD." You may also like Foxtrot, it visually isn't realistic but economy and logistics are everything. And Wargame: Red Dragon which is a RTS game and the closer that I got to understanding modern combat meta, equipment and tactics.

War is sad but it's funny that many of the things that I saw on Wargame are also happening on the Russia x Ukraine war. Like suicidal helo rushes, combats quickly protracting, bloody urban combats, advanced tanks being wrecked by cheap ATGM, artillery spam, counter-artillery duels and ammo reserves quickly running out. Though no game ever gets closer to the scale that is real war.