Mr. Ely. Moving now to the next column, labeled "Primary Duty," one abbreviation which recurs is "DUINS." Could you tell us what that means?
Colonel Folsom. Duty under instruction.
Mr. Ely. And the entry of 12 September 1957 has an abbreviation which I believe refers to the sort of job which Oswald was performing. Could you tell us what that stands for?
Colonel Folsom. In this case he was a replacement trainee.
Mr. Ely. Well, that is the entry for 9 July 1957. That stands for replacement trainee. Could you tell us what the entry for 12 September 1957 is?
Colonel Folsom. It indicates that he joined Marine Air Control Squadron, No. 1, Marine Air Group 11, First Marine Aircraft Wing, Fleet Marine Force, care of "FPO" San Francisco. This is a mailing address for an organization in the First Wing which at that time was in Japan.
Mr. Ely. And what was the job that he performed?
Colonel Folsom. He was an aviation electronics operator.
Mr. Ely. All right. I think that with the help you have given us, anybody looking over this record which appears at page 3 and 4 of the Folsom Deposition Exhibit No. 1 could readily understand the progress of Oswald's service.
Turning now to page 5 of the exhibit, I notice that before Oswald was awarded his final MOS, he was awarded an MOS, that is a Military Occupational Specialty, of 6400. Do you know, Colonel, what that stands for?