Police said Ajmal Amani, 41, was holding a knife with a 6-inch blade.
New Zealand froze most port calls by U.S. Navy ships in 1985.
The deadline to be vaccinated is Dec. 15 for active-duty soldiers and June 30 for Reserve and Army National Guard troops.
Since World War II, the U.S. has treated the Marshall Islands, along with Micronesia and Palau, much like territories.
Philippine forces use a grounded warship, the BRP Sierra Madre, as an outpost on the submerged but strategic shoal.