covert military blood drive?

Kuro5hin.org has an essay on the patches of covert ops military units. Some of them may be accurate, but some just seem too unlikely to me. For example, I'm on the fence about this patch for a unit that seems to be delivering blood (?). It's plausible that some unit might have a sexy nurse mascot, but the likelyhood is probably inverse to the unit's proximity to medical care. Plus, the image on this "patch" is an illustration, not embroidery! Still, you never know...