is it rank inflation?
In the old days, the OC of a coy in OCS is a Captain.
Back in 1978, the CO of 1 SIR was CPT Gwee Peng Hong (later promoted to MAJ), who was an OC at 1st Commando Battalion prior to being CO at 1 SIR.
He was from the first batch OCS.
His peers were, MAJ Neo Poh Chuan (CO 3 SIR or 4 SIR), and MAJ Cow Giak Piak (CO 3 SIR or 4 SIR), and LTC Chng Teow Hua (combat engineer officer, who was Comd 2 SIB)