This is how it worked:
PLC was two summers of training.
The first summer of training (6-wks) was held between your junior and senior year at university.
The second 6-wks of training was held immediately after graduation from university.
Once complete you received your Reserve commission.
It was in no way associated with ROTC.
“French listed his service as “USMC (ROTC) 1977-1978,” which he later explained was six weeks training at the Quantico, Va., Marine Corps base.”
If PLC is not related to ROTC, it sounds like he is getting his lies confused.