tion of the power of the Secretaries to employ exchange employees by appointment. The House and Senate Reports on Pub. L. 91-350 explicitly recognized that employees of nonappropriated-fund activities, when performing their official duties, are employees of the United States. S. Rep. No. 91-268, supra, at 2; H. R. Rep. No. 91-933, supra, at 2. Further, Congress has specifically granted exchange employees certain rights afforded only appointed employees, and, more important, has specifically excluded them from the coverage of certain statutes granting rights to appointed federal employees. See statutes cited in AR 60-21/AFR 147-15, c. 1, § I, ¶ 1-8. Of particular import is their exclusion, through the operation of 5 U. S. C. § 2105 (c), from the provisions of the Back Pay Act, 5 U. S. C. § 5596. The Back Pay Act is the means by which appointed employees subjected to unjustified personnel action are given a cause of action against the United States. The Act is made necessary by the fact that, absent specific command of statute or authorized regulation, an appointed employee subjected to unwarranted personnel action does not have a cause of action against the United States. Keim v. United States, 177 U. S. 290, 293-296 (1900); Sampson v. Murray, 415 U. S. 61, 69-70 (1974); United States v. Testan, 424 U. S. 392, 405-407 (1976). Since the Act deals only with appointees, the specific exclusion of AAFES employees from the coverage of the Act would seem to indicate a congressional recognition that they may be appointed, but that appointed AAFES employees should not be allowed to sue under the Act.
This is not to say that an exchange may never employ a person pursuant to a contract of employment. The Secretaries have provided, by separate regulation, for a process under which a person may be employed by contract. AR 60-20/AFR 147-14, c. 4, §§ II and III