Factual error: The uniform the female soldier is wearing when she comes back home is all wrong: the camo pattern is that of the USMC digital desert uniform but it has "US ARMY" chest tags (in a strange size and position, by the way). The US flag and unit insignia are on the wrong arms. The cut of the jacket is ACU, the pants are true USMC. (00:15:00)
Factual error: During the scene where the helicopter leaves the hospital roof, a Canadian registration number is visible under the front doors. An aircraft which operates solely within the US, which is what would almost definitely happen for a helicopter operating in a city in Colorado, would legally have to have a US registration due to cabotage laws concerning the registration of aircraft. AVPR was filmed in British Columbia, Canada, which explains a Canadian registration number, since all Canadian aircraft registration begin with "C". (01:28:35)
Factual error: The nuclear device used at the climax of the film is shown to be dropped by an F-22 raptor however the designation used on the tactical display the "General" is looking at is for a much larger weapon that cannot be deployed by a fighter/bomber.
Chosen answer: Although not proven, the injuries and the wide array of trophies and equipment may imply a long life of hunting. Further as it is receiving official distress signals from what may have been the home world, it is possible it plays the role of 'clean up crew' to mitigate exposure of Predator activity and lost equipment to prey species.
According to the directors, the injuries were a direct homage to Broken Tusk, the primary Predator character in the original Alien vs. Predator comic book.
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