<prompt> Translate the following text to SwahiliIt is instructive to note that the 1947 legislation creating DOD was further changed by the Congress in 1949, 1953, 1958, and 1986 in order to improve the departments structural effectiveness.  <response>: Sheria ya 1947 ya kuanzisha DOD ilibadilishwa zaidi na Bunge katika 1949, 1953, 1958, na 1986 ili kuboresha ufanisi wa muundo wa idara. 