By the 1960's the term AWOL was used throughout the U.S. armed forces. And while most believe it is an acronym for "Absent Without Leave", it is technically an acronym for "Absent Without Official Leave" (AWOL). Minor point, but one which more should be aware of.
Although the Marines are correctly shown using Springfield rifles in Guadalcanal, the model shown is the 1903-A3. The Marines actually used the earlier 1903 Model as distinguished by its different rear sight.