Covering several different posts...
#13 is Brian Nunez.
UNI #52 is McDermott.
My folks have a few pieces of that old turf back home. It's worse than that 'indoor/outdoor grass' people used to put in their three-season porches. Still, it's nostalgia. Can't get rid of it.
The red helmets were introduced by Criner, not Duncan. Here are the details: "In the mid-1980s, ISU head coach Jim Criner instituted an 'award helmet,' instead of merit decals. ISU's helmet at the time was a yellow shell with a red stripe and logo; the award helmet was a red shell with yellow stripe and logo. In a 1983 newspaper article, Criner said, 'By providing a different-colored helmet, you won't see running backs and wide receivers with 10,000 decals on their helmets and some ol' offensive and defensive linemen, who do the majority of the work, with nothing on their helmets.' According to the 1985 ISU football media guide, 'Yes, using
two different-colored helmets is legal. The players simply are required to wear matching jerseys.' Of course, this made scouting easy for the opponent -- just find the guys in red helmets and key on them."
ISU wasn't the first or last to use different-colored helmets, but I believe it has since been outlawed.