MOS Military Occupational Specialty
The safest MOS in the Army would be one dealing with the Army Band, Human Resources, or finance. These include the MOS - 42F, 42R9B, 42 S, or 44C.
Army 82nd airbone is a MOS. This is a job in the Army.
The MOS of 812 designates a heavy weapons man, in particular an nco. This was effctive July 1944 for the US Army.
MOS is Military Occupational Speciality, and I believe the T is an indication that the service member is still in training, as opposed to MOSQ, which indicates that they are qualified in their MOS (i.e., have completed training in their career field).
Mail clerk is a supplemental duty - it doesn't carry its own MOS.
91W
MOS, military occupational specialty
Anywhere, 35F Intelligence Analyst is a MOS that can be stationed at any Army Base.
The Army Medical Service Corps Military Occupational Specialty (MOS) begins with 91. A Health Care Specialist is 91W. See related links for list of Army medical MOSs.
Medical Entomologist
voice radio ops
Interior electrician, you play with electricity.