20 CFR § 211.7 - Compensation credited for creditable military service.
In determining the creditable compensation of an employee, the following amounts shall be credited for each month of military service, provided the employee's combined monthly railroad and military compensation does not exceed the maximum creditable amount:
(a) $160 for each calendar month before 1968;
(b) $260 for each calendar month after 1967 and before 1975;
(c) For years after 1974, the actual military earnings reported as wages under the Social Security Act.