Rye Field Model RM-5091 1:35 T-55AMD Drozd Active Protection System with workable track links

Drozd (Russian: Дрозд, IPA: [ˈdrost] (listen), lit. 'thrush') is an active protection system (APS) developed in the Soviet Union, designed for increasing tanks' protection against anti-tank missiles and RPGs. It is considered the world's first operational active protection system, created in 1977–78 by the KBP design bureau of A. G. Shipunov [ru] as Kompleks 1030M-01. Its chief designer, Vasily Bakalov, was awarded the Lenin Prize for his work on its development.

Drozd uses 24.5 GHz Doppler radar to detect incoming rounds travelling between 70 and 700 m/s (to avoid engaging small arms or other faster projectiles). Its computer determines when to fire a 107 mm projectile. When the incoming round is at 7 m range, the Drozd fragmentation warhead detonates, spreading 3-gram slugs to destroy the incoming round. The Drozd system was relatively complex, requiring a radar array and two launch tubes on each side of the tank turret, and a large electronics package on the turret rear.

The project was abandoned by the Army, but completed by the Soviet Naval Infantry to increase protection for about 250 older T-55 tanks in 1981–82 (newer T-72s were problematic on landing craft, due to size and weight, and $170 million Drozd development was much cheaper than a commencement of an all-new time-consuming tank design). Tanks were upgraded to T-55M standard and equipped with Drozd at the tank rebuilding plant in Lviv, Ukraine, and kept in war stores for secrecy. The rebuilt tanks were designated T-55AD, or T-55AD1 if they had the newer V-46 engine. Drozd APS was later replaced by the simpler non-APS Kontakt-5 explosive reactive armour.