In the movie Live. Die. Repeat. (a.k.a. Edge of Tomorrow) the soldier and the Angel of Verdun together are searching for the Omega.
I am aware there is a time loop! But Tom Cruise every time wake up on "day 1" and the army starts its fight on "day 2", where he dies.
Reading this question on movie.SE: Why does Bill Cage wake up in the Helicopter? the timeline is like this:
1.Wakes up in the early morning on helicopter. Meets General, gets tazed.
2.A few hours pass.
3.Cage wakes up in the mid to late morning. This is where the time loops reset to throughout the film.
4.Day of training on the military base.
The next day, the invasion occurs. During that day, they wake up, get in gear, and ship out; hours would have passed during all that. Then Cage manages to kill the Alpha, and get its blood mixed with his own. This must have happened 24 hours after step 2 above, during the hours that Cage was out.
Why do they wait until the next morning? Why do they not start the same day the soldier comes to meet the Angel of Verdun after he wakes up?