m777M777 is the world's first 155mm Howitzer wehing less than 10000 lbs (4218 kg). Selected by the U.S. Marine Corps and U.S. Army as their next generation MediumM777 is the world's first 155mm Howitzer wehing less than 10000 lbs (4218 kg). Selected by the U.S. Marine Corps and U.S. Army as their next generation Medium