The student body of the Academy is known as the Cadet Wing. The students, called "cadets", are divided into four classes, based on their year in school, much like a civilian college. They are not referred to as freshmen, sophomores, juniors and seniors, however, but as fourth -, third -, second-and first class cadets, respectively. Fourth class cadets (freshmen) are often referred to as "doolies," a term derived from the Greek word ("doulos") meaning "slave" or "servant." Members of the three lower classes are also referred to as "4 degrees," "3 degrees" or "2 degrees" based on their class. First-class cadets (seniors) are referred to as "firsties." In the military structure of the Cadet Wing, first class cadets hold the positions of cadet officers, second class cadets act as the cadet non-commissioned officers and third class cadets represent the cadet junior non-commissioned officers.

Answer this question based on the passage: what are freshmen called at the air force academy? Let's have some stream of consciousness first.
The relevant information is: Fourth class cadets (freshmen) are often referred to as "doolies," a term derived from the Greek word ("doulos") meaning "slave" or "servant." So, the answer is doolies.