10/31/2010. Under the s/n 33-320 and 33-321, the USAAC bought two T-32 transport (also known as CW-4) with the designation YC-30, the first was delivered on May 12, 1933. Both YC-30s were initially used as VIP transports and then as regular staff transports. The first, 33-320, was decommissioned on June 3, 1938, while the second was damaged beyond repair in an ground collision at Maxwell Field, Montgomery, Alabama, on September 9, 1938.