The Jacksonville Port Authority (JPA), also known as JAXPORT, is the inependent government agency that owns and operates much of Jacksonville’s Seaport System, including (but not limited to) the following: docks and wharfs, cranes, a passenger cruise terminal, warehouses, paved open storage areas, and road connections to the public highway system. JPA maintains these facilities and manages their overall use. Private companies pay lease and rental fees to JPA in order to operate from the seaport. This revenue funds the day-to-day operations so that public tax dollars are not required. Security guards are on constant patrol, supported by the Seaport Security Unit, made up of 11 officers and 2 sergeants on contract from the Jacksonville Sheriff's Office. Department of Homeland Security also has a presence with United States Customs Service and United States Border Patrol agents.