Revised 1 May, 1945.
AAF Manual No. 50-12.
"Published for Headquarters, AAF, Office of Assistant Chief of Air Staff, Training by Headquarters, AAF, Office of Flying Safety" according to title page.
Manual dated March 4, 1948 (replacing an earlier version dated 10/15/47), plus revisions dated April 30, 1948 and October 1, 1948.
Publication number AN 01-5EUA-1.