ORLANDO, Florida — The Marine Corps’ top officer in charge of training on Tuesday outlined the service’s sweeping new strategy that promises to modernize how troops learn and ready them for a faster, more connected era of combat. The three-part plan looks to bolster the service’s occupational training, professional military education, unit-level training, advanced individual training and service-level exercises, said Lt. Gen. Kevin Iiams, head of the Marine Corps’ Training and Education Command.