Since Sports Are Now On - What Are You Watching?

Hilariously, he's joined on his mission for a time by soldiers from the very unit he rescued/killed in the opening, and they like him as much as you expect they would. At this point it's already been revealed that Leo is actually a robot, and he chose Harp for this mission specifically due to his tendency for moral ambiguity. You're doing special ops in enemy territory, dealing with arms dealers, warlords, resistance leaders, etc; you're going to have to make decisions not everyone would agree with, so that tracks. Their mission is to stop cold war nuclear codes from falling into the hands of the resident warlord.

But the plot twist is clumsily revealed in a series of exposition-heavy scenes where Leo tricks Harp into assisting him into overriding his own failsafe systems and act on his own, no longer beholden to his programming. Leo is now a rogue agent, and Harp, a known substandard soldier and maverick, is on the hook for it. A few admittedly decent action sequences and a fake death by Leo later, we find out Leo's plan-- to steal the nuclear codes from the warlord-- so he can use them himself. It's up to Harp to stop him before he can launch nuclear missiles at the US. The resistance also wanted to launch the missiles at the US it turns out, again to teach them how it feels to have the war come to your doorstep instead of treating it like a video game (they go heavy on this theme right from the jump, with Harp snacking on gummy bears on his base in Nevada, as he watches men die on the front lines from his drone camera).

The final twist however, is actually moderately clever, as Leo's plan isn't simply to start a war because machines always decide humans need to die; his decision is actually that he, the machine, was a bad idea by humanity, using a proxy to fight wars for them instead of having the empathy to avoid conflict in the first place. Again with the gummy bears and video games. To reiterate, the message being drilled into our heads is that the US should not be fighting these endless wars around the globe, seemingly without care for those who have to actually live with the consequences.

Harp ultimately catches up with Leo and is able to defeat him and call in a drone strike which destroys the silo before the missile can be launched. This is where the film completely falls apart. Harp's superiors praise his actions, and send him home to his fiancé. Well done, soldier. So...about the conflict you said was wrong. It isn't going to end. The warlord was killed, but someone will rise in his place. The resistance still hates the US, the separatists and loyalists of the region are still in open conflict. There is no scene featuring Harp even discussing the morality of the situation or Leo's plan with his superiors. He's just happy to go home. Hey, the war didn't come to our doorstep after all, so it's business as usual. There's not even a reason to suspect the US won't make more Leos; after all it was Harp's fault for overriding his protocols.

Why did they spend two hours preaching to us just to toss out the message at the end? It's not portrayed as an ambiguous ending, it's quite clearly a "He did it, now he can go home," kind of happy ending. Very strange.