That brings back topsy-turvy memories...in USMC Boot Camp (1966) during our two weeks at the range I could run Expert one day, and Marksman two days later...with a Non-qual in between....and then go back to expert.
Ended up Sharpshooter, IIRC. But at the end of my enlistment I Non-qualed and didn't give enough of a sh*t to try again. In those days, we all wanted OUT more than anything; there were no "lifers" in 1968.
That's why when I see these shows where Lee Harvey Oswald or James Earl Ray couldn't make that shot I'm not buying it. I couldn't make a 300 meter shot in the prone non-supported position but sometimes I could.