From NetFlix:

Based on his memoir of the same name, this military biopic centers on legendary sniper Chris Kyle, who amassed a record number of kills on the battlefield during his 10-year career as a Navy SEAL.

Certainly each battle episode was exciting. But that is more or less the content of the film, i.e. many harrowing battle scenes. Chris Kyle’s insistence on going back for 4 tours (1000 days) caused his wife much unhappiness. In the film when he finally comes home, his rehab is made to look easy because he dedicates himself to helping other veterans. It could not have been that easy. Toward the end of the film he is murdered by a veteran he was trying to help, although we do not see that murder. As the screen credits go by we see the actual photos of the funeral held in a stadium with much pomp and ceremony. In fact, Bradley Cooper looks quite like the real Chris Kyle. Compare the Bradley Cooper of “Silver Linings Playbook” with the Bradley Cooper in this film, my guess is that he gained quite of bit of muscle for the role.

In the Wikipedia article, Bradley Cooper is quoted as saying:

“We looked at hopefully igniting attention about the lack of care that goes to vets. Discussion that has nothing to do with vets or what we did or did not do, every conversation in those terms is moving farther and farther from what our soldiers go through, and the fact that 22 veterans commit suicide each day.” Cooper said that an increasing number of soldiers are returning from conflict psychologically damaged, only to be more or less discarded.