For the Army, you can still come in to the military directly as a Warrant Officer with a job of 153A - Rotary Wing Aviator. Commonly referred to as streets to seats or highschool to flightschool. Its a bit hard to go through the process, compared to a warrant packet while already enlisted, but possible. Most recruiters are not proficient at this process so be sure to do your research first, or you may end up duped and enlisted. There are no guarantees to become a pilot by enlisting except for UAVs, but who wants to fly RC planes for a living anyways.
Mike