announcer: from nbc news, this is today with matt lauer and savannah guthrie. live from studio 1a in rockefeller plaza. good morning, everyone, welcome to today on a tuesday morning, i m savannah guthrie. and i m matt lauer along with al roker and natalie morales. a lot of fireworks expected on capitol hill today. not only over the military assault cases. but also, you ve got the growing scandal in the irs. the leaders of the conservative groups who were targeted are going to testify in a separate hearing today. have a lot more on that in a moment from nbc s lisa myers, but we want to begin at the pentagon. mick, good morning to you. good morning, savannah. all the military s top brass are marching up to capitol hill this morning where they re sure to face a tough grilling on a rising number of sexual assaults in the military. this on top of the latest incident at the elite naval academy which allegedly involves a volatile combination of sex, alcohol and footbal