Read this and answer the question. If the question is unanswerable, say "unanswerable".

An FBI special agent is issued a Glock Model 22 pistol or a Glock 23 in .40 S&W caliber. If they fail their first qualification, they are issued either a Glock 17 or Glock 19, to aid in their next qualification. In May 1997, the FBI officially adopted the Glock .40 S&W pistol for general agent use and first issued it to New Agent Class 98-1 in October 1997. At present, the Model 23 "FG&R" (finger groove and rail) is the issue sidearm. New agents are issued firearms, on which they must qualify, on successful completion of their training at the FBI Academy. The Glock 26 in 9×19mm Parabellum, and Glock Models 23 and 27 in .40 S&W caliber are authorized as secondary weapons. Special agents are authorized to purchase and qualify with the Glock Model 21 in .45 ACP. Special agents of the FBI HRT (Hostage Rescue Team), and regional SWAT teams are issued the Springfield Professional Model 1911A1 .45 ACP pistol (see FBI Special Weapons and Tactics Teams).

What class was the first to receive the Glock .40 S&W pistol?
New Agent Class 98-1