I saw this movie about aliens that were like a swarm of bugs or something killing people and stuff. When someone died to those aliens they turned into the same stuff as the alien.
There were man and woman who fell in love and in the end guy made ultimate sacrifice by going into that alien swarm with a bomb or nuke or something like that blowing them up.
Other things I remember as that there was this (maybe black dude) who used minigun or machine gun that was on the army cars roof to shoot the alien swarm and he run out of bullets and didn’t run or anything just accepted his death.
Could this be Episode 5 titled “Devil Take the Hindmost” of “Halo: Nightfall”?
https://www.imdb.com/title/tt4095570/
At the end of this episode one of the soldiers has to manually detonate a nuclear device to kill the alien swarm and save the others. He sacrifices himself in the process.
You can watch this episode here:
https://www.dailymotion.com/video/x2d02p5
At 13:35 starts a scene where a guy, weapon in hand, doesn’t shoot at the coming alien swarm, he just accepts his fate and the swarm kills him.
https://www.dailymotion.com/video/x2d02p5
At the end of the episode, ca. at 19:02 one of the soldiers is left behind with the nuclear device, there is a countdown and the device detonates, and the soldier sacrifices himself in the process.