This photo laboratory order envelope, dated June 1960, once held the negatives for a series documenting National Guard NCO Academy training at Fort MacArthur, California. Handwritten and typed notations such as these were essential bookkeeping tools for military and commercial photo labs, allowing images to be tracked, reprinted, and filed correctly — and today they give archivists and historians critical clues for dating and identifying otherwise unlabeled photographs. Project: 218665