I'll tack on, one of the guys I contacted asked me to write up a career summary, highlight stuff I wanted highlighted. I just went through OPRs/awards, wrote out bullets. It was nothing pretty, but summed up everything I'd done in the military pretty clearly. Think it was about 3 pages, took maybe 30 minutes. Out of that he wrote a great rec.
Make it easy for whoever you are asking. It's polite, and you'll get better recs for it.