Fort Stewart shooting suspect in custody, no active threat to the community

We're continuing to follow the breaking news of a shooting. At least five people have been injured or five casualties at Fort Stewart base in Georgia. Now the question turns to who did it and why. I want to bring in NBC News national law enforcement correspondent Tom Winter, retired ATF, retired ATF special agent in SNBC terrorism analyst Jim Kavanaaugh. On the phone is our senior national security correspondent Courtney QB. Uh let's set set the stage if we can Tom. What do we know at this hour? >> Sure. So ...