Yet more inconsistencies

Yes, I know - this film's full of them and these may have been mentioned previously.

*When the grunts are told about their mission, one answers for all and the military commander accepts this without hesitation - *beep* that.

*They are told to assemble at 0300hrs. When they meet for the mission, it is clearly daytime - late afternoon by the looks of it.

*HUGE protagonist confusion. Which of the grunts are we supposed to empathise with? The leader was picked off by a raptor in the first few seconds and I assumed the guy with the moustache would take over as he showed some spirit in the briefing room earlier. Not to be, he's gobbled up soon after. What's the point of having the grunts set up as the main protagonists if they all just die as soon as they get to the past?

*How the hell did young Frank know that they'd be facing off with Big Red at the tunnel entrance at that time, there's no way? And what happened to the tank he brought with him?

*Where was the rest of the US Army?

You get the idea.