"do a google search of basepay for an e5 with over three years in."
Ah, ask for a posting to USNA?
Check out the local American Red Cross chapter, sometimes they have sailing classes *very* inexpensively. $150 and less.
The other option is to find out where there is local racing and sailing, and show up before the races, wearing boat shoes and carrying a cold six-pack, and saying "I don't know anything about boats, but I want to crew and learn."
Someone out there will need railmeat, or crew, and they WILL be glad to see you and take you out. Doesn't mean they know how or what to teach, but it is one way to get started for free. Well, for the price of the beer.