Died of Wounds
It referred to as "active duty."
It is the selective service designation for "Fit for duty".
Many military and paramilitary organisations use the rank designation of "Sergeant". The spelling "Sargent" is also correct according to spellcheck.
barrett M82
The Vice President of the United States does not hold a military title. They are a civilian government official and do not have a specific military role or designation.
first and second numbers
M203 is the US military designation for an under-barrel 40mm grenade launcher
Cargo, I think, a C130 is a cargo/transport plane
Free On Board (FOB)
The "201 file" is the military's designation for "personnel file". Every soldier, sailor, airman and marine has a 201 file. The designation comes from the form 201 the military used prior to the Spanish/American war, the predecessor to the DD-201-A used today.
The military designation for the vehicle was GP for General Purpose. It quickly became Jeep when said and the name stuck.