Keg re-purposing is always a touchy subject around here, but you may want to make sure it's not still the property of AB before cutting into it. The Brewers Association set up a web site to return wayward kegs. Can't speak to how well it works, or if you even want to use it but here you go.
California Pale Ale
Rye IPA, Citra Pale Ale, ESB, CO Pale/Simcoe SMaSH
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- Wilhelm II of Germany