Hi...unlike thee more combative specific USAR or USMC, the standard term to acquire retirement has been 20 years service time. It was so when I enlisted in 1970. At 20, you can retire or choose another 4 year enlistment. If there are medical reasons, take the 20.
I have no idea what your point is.
I should not have posed this as a question. It’s a statement. It takes 20 years to earn a normal retirement.
I retired at 28.