OGFR stands for "Opioid Growth Factor Receptor"
Military Occupational Specialty, the equivalent of a job title or description in civilian life.
The British military title CIGS stands for Chief of the Imperial General Staff. Chief of the Imperial General Staff (CIGS) was the title of the professional commander of the British Army from 1908 until 1964.
Wikipedia says it is Aktiebolaget Gas Accumulator.
It is not a military custom it's a military command, 'stand at ease' means to relax from the 'stand to attention' command.
Depending on how it's used, it could stand for "Military Specification", meaning the ability to withstand shock, dust, or harsh environments.
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.
Military Specification
MPO stand for Military Police Officers.
Doctor
I am not aware of any military job title, but ARSIC generally stands for Afghan Regional Security Integration Command.
It is the military term for a 'search and rescue dot.'
Shogun.