Other mistake: Towards the end when we see one of the $100 bill plates up close, the plate is not of any money ever put into production in the US. While I know most movies do not try and use actual money, there are things that don't match how real money is made: serial numbers are not on the plates, circle around Ben's head doesn't go to the border, "The United States of America" is missing above the "100" on the left, just to name a few.
Other mistake: In the desert base camp, it is supposedly in the middle of the day or in pretty hot weather, but BA's breath can be seen in one shot.
Other mistake: In the montage at the end, Murdock is misspelled Murdoch on the military forms.
Other mistake: When Pike chases after BA by rappelling down (using his suit jacket and hand to do so), he uses the same rope Hannibal used to get into the building. Hannibal is seen with a rope bag and when he escapes into the building several stories below, he is seen unhooking but not throwing the bag out the window. Unless that had happened, Pike wouldn't have been able to use the rope to descend to the sidewalk.
Answer: They can, but only if they have a set of modified rotor blades to be able to do it. The Apache for one is able to do it. The Huey in the movie however is unlikely in reality to be able to do it - there would be no need to fit the modified rotors to what is essentially a transporter.
GalahadFairlight