This manual, US Air Force and US Army Technical Manual TM 4-48.21 (FM 4-20.121 TO 13C7-6-21) Airdrop of Supplies and Equipment: Rigging Engineer Equipment (Tractors and Tractor-Dozers), tells and shows how to prepare and rig the D-5B (Type I) tractor-dozer, the John Deere 450G LT full-tracked commercial bulldozer, the Deployable Universal Combat Earthmover (DEUCE), the T-200 Bobcat Compact Track Loader, the 420D backhoe loader, the 410 backhoe loader, the Small Emplacement Excavator (SEE), the 277 multi-terrain loader (MTL), and the All-Purpose Remote Transporter II (ARTS II) which are rigged for low-velocity (LV) airdrop from a C-130 and C-17 aircraft. This manual combines FM 4-20.121 and FM 10-539 into one manual, as well as, adding the T-200 Bobcat Compact Track Loader, the 420D backhoe loader, the MTL, and the ARTS. This publication applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR), U.S. Air Force, Air National Guard (ANG), Air Force Reserve Command (AFRC) unless otherwise stated. The proponent of this publication is the United States Army Training and Doctrine Command (TRADOC). The proponent has the authority to approve exceptions or waivers to this regulation that are consistent with controlling law and regulations.