BUFFALO, N.Y. — Keeping the Buffalo & Erie County Naval & Military Park from going under during the pandemic has been hard enough without also having to worry about keeping one of its star attractions afloat.After losing 87 percent of its revenue because of COVID-19 closures and cancellations during the past year, the park recently discovered the destroyer USS The Sullivans is taking on water and listing at its dock in Buffalo’s inner harbor.The 78-year-old decommissioned vessel is named in honor of the five Sullivan brothers from Waterloo, who were killed in action when the USS Juneau was sunk by the Japanese in the South Pacific during World War II.Their mother, Alleta Sullivan, christened the ship, which saw action in World War II, the Korean War and the Cold War.