Written by: Webmaster2 April 11, 2013 The Apache Block III National Airspace Trainer (AB3NAT) was recently demonstrated at the University of Alabama in Huntsville. The AB3NAT is an asset that is designed to allow Manned-Unmanned-Teaming (MUM-T) training for Apache Block III pilots to be performed in the national airspace. Read more in articles at AL.com and DVIDS.