Military unit
151 Air Defence Regiment (Self Propelled) is part of the Corps of Army Air Defence of the Indian Army. It consists of 1511, 1512 and 1513 air defence batteries.
Formation.
151 Air Defence Regiment was raised on 1 July 1966 at Army Ordnance Corps Centre at Secunderabad. 
Equipment.
At raising, the regiment was equipped with Bofors 40 mm L/60 guns. The unit was re-organised as a Composite Air Defence Regiment in November 1977, when it was equipped with one battery of the Soviet ZSU-23-4 Shilka self-propelled, radar-guided anti-aircraft weapon system and two batteries of Soviet ZU-23 towed 23×152 mm anti-aircraft twin-barrelled auto-cannons. On 1 December 1983, the regiment was re-organised as 151 Air Defence Regiment (Self Propelled) with three batteries of Schilkas. The unit became the first one to be equipped with the upgraded Schilka systems in 2014.
Operations.
The regiment has taken part in the following operations:
The unit equipped with L/60 guns took part in Operation Cactus Lily in Jammu and Kashmir in December 1971. 1511 battery played an important role in the defence of Srinagar airfield. The airfield was subject to daily Pakistani air attacks between 3 and 6 December, 1971. There were sporadic raids after that till 10 December. The AD gunners, to their credit, foiled every attack to this vital airfield and claimed three hits, including one downing of a Pakistani Sabre jet. 
1512 battery did well in defending field artillery guns, wagon lines, Akhnoor ferry, Mandiala bridge and the divisional headquarters of 10 Infantry Division. Two troops were part of the 26 Artillery Brigade under 26 Infantry Division. 
For its effective deterrence during the battle, the unit was awarded the honour title 'Chhamb'. 
The unit won the following gallantry awards-
December 1986-March 1987.
Counter terrorism operations in Punjab (November 1982-February 1983) and Jammu and Kashmir (August 1988-June 1999). The unit won the following gallantry awards – 
Lieutenant Colonel R Shrivasvat was awarded the COAS Commendation Card for his commendable performance as a Brigade Major of an Infantry Brigade during the operations. 
December 2001-March 2003. The unit lost Havildar KBMB Tadavi and Gunner Gopa Kumar P during the operations.
References.
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