I am having trouble identifying this font. It is from some current shirts being sold from Nike. I'd like to use the same font for some shirts from my high school. Thanks,

32 minutes ago, sikshrik said:

shirts being sold from Nike

Most often than not, Nike, and athletic jerseys in general, use proprietary custom fonts, not retail ones.

Diamante is similar enough to mimic the look (especially if you artificially condense it).

Another possible substitute, though the M isn’t close—Ohio Collegiate.

It could also be “fontstructed”.