37 U.S.C. § 903 — Retired members recalled to active duty; former members

A retired member^* or former member of a uniformed service, or a member of the Fleet Reserve or Fleet Marine Corps Reserve, who is serving on active duty^* is entitled to the pay^* and allowances to which he is entitled, under this title, for the grade^*, rank^*, or rating^* in which he is serving. In addition, while on active duty, he is entitled to the pay and allowances, while on leave of absence or while sick, of a member of a uniformed service of similar grade, rank, or rating who is entitled to basic pay.