@pepsi_man The term GI has multiple meanings in the military, including:

Galvanized Iron
The original meaning of GI was galvanized iron, the primary material used to make military items like buckets. The earliest known written instance of GI is from either 1906 or 1907.

Slang for enlisted soldiers
GI is also used as slang for enlisted soldiers of the United States armed forces.

@pepsi_man

Rigidly adhering to military regulations
GI can also be used as an adjective to describe someone who is rigidly adhering to military regulations and practices.

Of a standardized style or type
GI can also be used to describe a standardized style or type issued by the U.S. armed forces, such as GI shoes or GI blankets.

Of or pertaining to a U.S. enlisted person
GI can also be used to describe something that is of, pertaining to, or characteristic of a U.S. enlisted person.

@pepsi_man

Although the OP may have used the term loosely. He is not wrong.

BTW, I am intimately familiar with the jargon and have used it frequently, at one point.
Don't try give some *Ackshually* quip on correct terms and usage.