Tugboat Spence and her barge Guantanamo Bay Express are owned by the American shipping company TransAtlantic Lines LLC. Together, they make a twice-monthly trip between Naval Station Mayport; near Jacksonville, Florida; and Naval Station Guantanamo Bay in Cuba. Each leg of the trip takes approximately 4 1⁄2 days and covers approximately 1,000 miles (1,600 km). Unloading the barge can take up to five days.
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