98XL isn't actually an MOS (Military Occupation Speciality). Instead, it's an enlistment option. The "X" means that the specific job is not known at the time of enlistment, and the "L" means the job requires foreign language proficiency.
Following Army basic training, recruits who enlist in the 98XL enlistment program attend language proficiency training at the Defense Language Institute (DLI), (unless they are already proficient in a foreign language needed by the Army).
Upon completion of DLI, recruits are assinged to one of the following specific 98-series MOS's, and attend AIT (Advanced Individual Training) for that specific job:
Physical demands rating and qualifications for initial award of MOS. Signals intelligence analysts must possess the following qualifications:
(1) A physical demands rating, of moderately heavy.
(2) A physical profile, of 222221.
(3) Normal color vision,
(4) A qualifying score on the Army Analysis Aptitude Test,
(5) A minimum score, of 105 in aptitude area ST.
(6) The soldier must meet TOP SECRET Security Clearance, and Sensitive Compartmented Information (SCI) access eligibility requirements.
(7) A high school graduate or equivalent.
(8) Never been a member of the U.S. Peace Corps, except as specified in AR 6 14-200, chapter 1.
(9) No information in military personnel, Provost Marshall, intelligence, or medical records which would prevent the granting of a Security Clearance, under AR 380-67,
(10) No record of conviction by court-martial.
(11) No record of conviction by civil court for any offense other than minor traffic violations,
(12) The soldier must be a U.S. citizen.
(13) Soldier and spouse must not have immediate family mem bers who reside in a country within whose boundaries physical or mental coercion is known to be a common practice, either against-
(a)Persons accused of or acting in the interest of the U.S.
(b)The relatives of such persons to whom they may reasonably be considered to be bound by ties of affection, kinship, or obliga tion. Near relatives will also include uncles, aunts, grandparents, father-in-law, mother-in-law, and relationships corresponding to any of the above persons in loco parentis (AR 630-5, para 6-2b).
(14) Have neither commercial nor vested interest in a country within whose boundaries physical or mental coercion is known to be a common practice against persons acting in the interest of the U.S. This requirement applies to the soldier's spouse as well.
(15) Meet career management and development criteria contained in AR 600-200, AR 6 14-200, and DA Pam 351-4.
(16) Formal training (completion of MOS 98C or 98G course under the auspices of the USAICS) mandatory.
(17) Be advised that due to the nature of training and assignments, temporary restrictions may be placed on foreign travel both during and after the term of service.
Information derived from Army Pamplet 611-21