Well, I thought this would be easy to find, but it's proven difficult. It's not your standard Pro Block or Varsity.. more like a hybrid semi-serif. It's close to Varsity, but small differences (long middle and exaggerated serifs on E, lowered R centerline, right-angle serifs on S characters) make me think it's either custom, or another lesser-known font. Any ideas?

Sorry for the small sample, but these five letters are all I've got!

(note: This is not the same font used on their vintage jerseys, shown here. It's a new style for this year, a modernized vintage, if you will.)