Section, acts May 28, 1924, ch. 203, 43 Stat. 194; Fespan. 11, 1925, ch. 209, 43 Stat. 872; May 21, 1926, ch. 355, 44 Stat. 604, which related to time spent at the Military and Naval Academies, expired with the appropriation acts of which it was a part.