I came across something very similar to this in a thriller novel:
At this stage, the rocket is experiencing its maximum acceleration, say about ten gees.
Here, the author has spelled out the common military-pilot slang term for “gravitational force” using gee. However, as this term is an abbreviation, and is in essence a unit of measurement, I'd have expected the written form to be G’s.
Similarly, I have heard people speak the unit “kilometer per hour” using the two-letter symbol for kilometer. However, I would expect this to be transcribed as “km per hour” versus “kay em per hour”.
Is this use of gee common? Is it correct?