Ground Program - This is the backbone of the Marine Corps.  When most people think of the Marine Corps, this is what comes to mind, because there simply is no better fighting force in the world.  We respond quickly with decisive force, and have never returned from battle without a victory.  Protecting that legacy will require you to act quickly and think even faster.  Whether you choose a combat arms or combat service support Military Occupational Specialty (MOS), your leadership abilities will be put to the test as you lead Marines in real world operations around the globe.  Some of the specialties available to you as a ground officer are:

Combat Arms: Infantry, artillery, tanks, combat engineer, amphibious assault vehicle.

Combat Service Support: Ground intelligence, human intelligence, signals intelligence, adjutant, communications, military police, logistics, financial management, public affairs, ground supply.
Aviation Support: Aviation intelligence, aviation maintenance, air support control, air defense control, air traffic control, aviation supply.

For more information, use the below handbook which outlines all MOS's and the MOS assignment process.
Military Occupational Specialty Handbook