Aviation Selection Test Battery The Aviation - Selection Test Battery is used by the U . S . Navy , Marine Corps , and Coast Guard as one criterion used in making selection determinations for officer aviation program applicants . The most recent complete revision of the ASTB was completed by the Naval Operational Medicine Institute ( NOMI ) in cooperation with the Educational Testing Service ( ETS ) in Princeton , New Jersey in 1992 . In 2004 , three new parallel forms of this ASTB version were released by NOMI , and Forms 1 and 2 , which had been in circulation from 1992 to 2004 , were suspended . The ASTB is used by the Navy Personnel Command ( NPC ) and the Commandant of the Marine Corps to select candidates for the Navy and Marine Corps pilot and flight officer programs . Portions of the test are also used by the Navy for selection into Officer Candidate School ( OCS ) . The Coast Guard currently uses the ASTB to select pilot candidates for training , and uses a subcomponent score from the ASTB for its nonaviation officer commissioning program . The ASTB is administered at Navy Recruiting Districts ( NRDs ) , NROTC units , Marine Corps Officer Selection Offices ( OSOs ) , and at numerous other permanent custody sites . The test is administered in a paper format , but at many sites it can be administered on a computer through a webbased system called APEX . NET . There are three versions of the test — Form 3 , Form 4 , and Form 5 . Each version of the test contains different questions , but all three versions have the same format , subtests , and number of questions . The complete test battery requires approximately 2½ hours to administer . The current version of the ASTB was constructed and validated to predict both performance and attrition through the primary phases of aviation training for Student Naval Aviators ( SNAs ) and Student Naval Flight Officers ( SNFOs ) . The entire test battery consists of 6 subtests : Retest policy . Examinees that would like to improve their scores on the ASTB must wait until the 31st day following their initial attempts before taking different versions of the test . For example , an individual that takes Form 3 during their first administration must take Form 4 or Form 5 during their second testing session . A third and final attempt at Form 3 , 4 , or 5 is authorized on the 91st day following the first retest . These test interval requirements cannot be waived , so it is important that examinees are aware of the forms taken during previous administrations and the amount of time that has passed between administrations . Three - test lifetime limit . A major change regarding the administration of the ASTB was the establishment of a three test lifetime limit in July 2004 . An examinee may only take each version of the test ( Form 3 , Form 4 , and Form 5 ) once , which means that an individual will only be allowed to take the ASTB three times during his or her lifetime . Examinees must take a different form during each retest , but the forms can be taken in any order . This limit only applies to Forms 3 , 4 , and 5 . Therefore , if individuals took a previous version of the test ( Forms 1 and 2 , which are no longer in use ) , it is not counted in this limit . Illegal testing . An examinee that retests too early or retests using a form that he or she has already taken will generate an illegal test . An illegal test means that the individual will not receive valid scores for the testing administration . On the other hand , the illegal test will still be counted against the individual ’ s lifetime limit .