former cadet at the U.S. Merchant Marine Academy in Kings Point and his friend pleaded guilty yesterday to conspiracy to smuggle the drug Ecstasy into the country, taking advantage of the academy's tradition of having cadets spend time on ocean-going merchant ships. Mark Posthumus, 30, and his friend, James Pagano, 30, both of Kendall Park, N.J., admitted in U.S. District Court in Central Islip that when Posthumus was a cadet at the academy between August 1998 and January 1999, they smuggled a total of 380,000 Ecstasy pills into the country. [snip] According to court papers, Posthumus and Pagano flew to...