For a lifelong hockey fan like Command Master Chief Gregg Snaza, it was a visit to the sport’s Holy Grail. But he didn’t have to travel far. On Feb. 25, the famous Stanley Cup was brought to his “doorstep” — the aircraft carrier Dwight D. Eisenhower, undergoing a planned incremental availability at Norfolk Naval Shipyard, Portsmouth, Va. Here’s the proof: The 34.5-pound silver-and-nickel alloy trophy — there’s only one, although its shape and size have evolved since it was first awarded in 1894 — annually goes to the National Hockey League championship team, whose members drink champagne out of the…