Definition of a Photon. A photon is the quantum of electromagnetic radiation. The term quantum is the smallest elemental unit of a quantity, or the smallest discrete amount of something.
General of the Army(GA) is a five-star general officer and is the second highest possible rank in the United States Army. A special rank of General of the Armies, which ranks above General of the Army, does exist but has only been conferred twice in the history of the Army.
The Military ranks used in Stargate are primarily from the United States Air Force, the United States Marine Corps, and the Russian Air Force. The ranks proceed as follows from highest to lowest. The United States Air Force does not have a First Sergeant rank. It is instead a duty denoted by a diamond within the upper field. They usually act in the capacity of a Senior Enlisted Advisor to a Squadron Commander. Only one individual was awarded the rank of General of the Air Force, semi-retroactively.