My DS received a similar call in the Fall of 2015 after not receiving an NROTC/MO scholarship.
He tried to talk my DS into doing PLC concurrently with AROTC (his college doesn't offer NROTC).
My son had by that time bonded with his Army ROTC unit. Feeling it would both dilute his efforts and be disloyal, he politely declined the offer from the Marine Captain.
Three weeks later he earned the Army scholarship.