(Left) Brig. Gen. Aaron Walter, commander of the 100th Training Division-Leader Development, visits the officers attending the Command and General Staff College Phase Two 4x4 Course at Fort Belvoir, Virginia, June 10, 2019. The 4x4 course is a pilot program that allows Army officers to complete the second of three phases in person during four weekends instead of the previous option of eight weekend classes or through distance learning.