While the entire second half of the movie is one massive fire fight, and while all the tension is plenty present, it is BEYOND obvious that Lurie (director) prioritized the experience not of action heroes but of a bunch of kids in their 20's and 30's who earned their stars and medals that day, and of exceptionally strong leadership from men who had greatness thrust upon them, so to speak.
Dozens of long tracking shots, watching guys in basketball shorts sprint the length of a football field under fire, mixed with static shots of bloodied soldiers in full gear camping out in a broken truck because there is nowhere else to go, and the spectrum emotions that could possibly fill that truck, mixed with explosions and plenty of hot metal...
Everyone does a phenomenal job, but Caleb Landry Jones broke me. Unbelievable performance, especially at the end while he's talking to his therapist. And the interviews of survivors during the credits, some of whom returned to portray themselves in the film. My goodness.
There are a few special effects that could have used a bit more TLC, but this might have been some of the best directing I've ever seen from someone who isn't just trying to make Oscar bait films. It wasn't necessarily as tight and as clean as something like 13 Hours or The Covenant, but it has way more heart and way more care poured into it. I almost turned it off in the beginning because I wasn't sure where it was going or what I was supposed to be invested in, but I was bawling by the end. Once the "big one" starts, I was both feet in. Brilliant.
People here are complaining about too many jokes in serious moments, or weird interactions between soldiers, but this movie was made by someone who served. He knew what he was doing and, having done a bit myself, every awkward moment was spot on. These are guys who don't get to interact with the real world. Guys who have to entertain themselves in completely isolated social environments with completely different rules and hierarchies. If there's a line of dialogue that doesn't seem like it "fits", that's because these dudes actually act like that in real life, and especially on deployment. It certainly adds to the immersion when you can recognize how real it is. It shouldn't take away from it. There's a reason The Last Action Hero was a parody of hyper-tough action films.