US Marine Corps Forces Central Command (MARCENT) US Marine Forces Central Command (MARFORCENT) US Marine Corps Forces Central Command (MARCENT) is designated as the Marine Corps service component for US Central Command (CENTCOM). MARCENT is responsible for all Marine Corps forces in the CENTCOM area of responsibility.
Aluminium carbide, chemical formula Al 4 C 3, is a carbide of aluminium.
There are two structures that can be called carbide. The first is when carbon exists in the -4 oxidation state in combination with a metal. Aluminum carbide, Al4C3, is an example. But aluminum carbide is definitely NOT ionic.