I'd like to add this one with the redshirt character tied onto a bed in sickbay
I still remember how I asked my friend in the good old days of VHS to freeze frame this (and the other shot) for better examination. But even in SD and on a 4:3 tube TV the basic delta / arrowhead was recognizable.
Interestingly, they could have used the restraining belt to cover the insignia.
Can't help but not to imagine Bob Justman making a short stop at the set during shooting and doing some "re-adjustman" of the belt.
However, given the viewing angle, for in-universe purposes they could have altered the delta / arrowhead to look somewhat different. Unfortunately the producers of the IAMD decided to go for an insignia that's not compatible.