Right. Very strict rules. One of the first things DIs were required to do when they picked us up in 1989 was ask if any of us would be offended by certain words. (absolutely true story!) Of course everyone was too nervous to say anything, so they took that as a 'no'. That's odd, I was in boot in 1989 (June 6th, platoon 1053 MCRD San Deigo) and they never bothered with those kinds of niceties.
This was right after we met our DIs and the officer administered their oath, and they were required to ask this in front of the officer. Parris Island, 2nd BN in May 1989.
That's my memory, anyway. It was just a formality, a nicety, as it were.