Lots of local bloodbanks will let you volunteer to be a recruiter and whatnot... but I think putting the donating itself down as a service on your application is a bit of a stretch. I personally think of it as a duty, which most people (who can donate) neglect. That being said...
I really hate the policies by which blood drives have to abide. First of all, I was technically ineligible to donate in the first place because I'm gay (and if you're a teenager and you're asked if you've had sex with another member of the same sex in the past few months, that's the exact same question). Second, I ignored that, really, and donated anyway. A month later, I got a letter in the mail saying they tested my blood and the first test came back positive for Hepatitis C, while the RIBA came back negative (which, according to the CDC means I don't have Hep C). I wasn't too worried (but still slightly freaking out) because you get Hep C from using injectable drugs, and I've never used any drugs, let alone injectable drugs. My doctor still wanted to run another test twice, and both times it came back negative. Still, according to CDC policies, I'm never allowed to donate blood again because of that one false positive. Because of ridiculous policies like this... and I'm going to bolden and make this large
only about one third of the population is eligible to donate blood.
I feel like I tell a little story in all of my posts. Half of which are made up for humor... but this is not humorous. It's true 🙁
But please tell your friend I said good job for donating, especially since so few people do. Because of your roommate, lots of lives have been saved. And the sad fact is that less than 5% of those 33% that can donate actually do 🙁 Why? Too chicken, methinks... I was only planning on doing the 2x Alyx donation once every six months (though it takes 4 months to become eligible) because it takes too much out of my exercise pattern (though that blood you donate takes 700 calories to regenerate, apparently! good diet regimen), but I was at least planning on doing it.
Luckily, though, on college campuses many more people donate blood than do in the general community. I think this is largely due to the higher level of education, as well as the competitions they have (ie., between fraternities... or the oh-so-famous who can give a pint the fastest... oh, wait, I've never seen that happening...)