This model kit is in 1/700 scale. The single sprue is connected by wires at the rear of the M113s. It includes: 2x M163 VADS (Air Defence), 2x M113 Anti Tank, 2x M113 Command Vehicle, 2x M113 Fire Support Vehicle with 76mm Gun and 2x M113 81mm Mortar.
According to Wikipedia: "The M113 is a fully tracked armored personnel carrier manufactured by BAE Systems. The vehicle was first fielded by United States Army's mechanized infantry units in Vietnam in April 1962. The M113 was the most widely used armored vehicle of the U.S. Army in the Vietnam War, earning the nickname 'Green Dragon' by the Viet Cong as it was used to break through heavy thickets in the midst of the jungle to attack and overrun enemy positions, but largely known as an APC and ACAV (armored cavalry assault vehicle) by the allied forces.
A huge number of M113 Armored Personnel Carrier variants have been created, ranging from infantry carriers to nuclear missile carriers. The M113 armored personnel carrier has become one of the most prolific armored vehicles of the second half of the 20th century, and continues to serve with armies around the world in many roles."