Insignia question

In the movie "From Here To Eternity" (1953) Burt Lancaster's character, First Sergeant Warren, has three stripes, two rockers, and the diamond between them.  However, in last night's re-watching of "Band Of Brothers" (2001), I noted that the First Sergeants insignia was three stripes, three rockers with the diamond between them.  The latter is consistent with my own Army experience in the late-Sixties.  Did Hanks and Spielberg let an historical inaccuracy creep into their film?