over pressurization system for NBC protection. It also has self-sealing tires, a central tire inflation system and antennae mount on the right hand side of the rear of the roof. It has a side door in the left side of the front part of the troop compartment. Some BTR-60PBs also lack one of the firing ports on the left side of the hull. Late production BTR-60PBs have the same sighting improvement as the BTR-70, which consists of a small additional episcope sight, which faces to the rear on the turret roof. The vehicle carries 500 rounds for 14.5 mm KPVT heavy machine gun and 3,000 rounds for 7.62 mm PKT coaxial light machine gun. It was also known under the designation GAZ-49B. BTR-60PB produced during the BTR-80 production run. It has a side door in the right side of the front part of the troop compartment. BTR-60PB converted into an agitation and propaganda vehicle. It is fitted with the same turret as the BTR-70ZS. BTR-60PB converted into a command vehicle equipped with two side-mounted angled telescopic masts. GAZ-4907 – BTR-60PB converted into a specialized chassis used by a few command variants. BTR-60PBK (K stands for – "command") (1975) – Company commander version, based on the specialized chassis GAZ-4907. This version is equipped with three radio sets (two R-123 and one R-148), as well as three whip antennas and an antenna mast on the left upper hull. Late-production models have a modified turret and additional Pin Stick antenna. BTR-60R-145BM "Chaika" – Turret-less command vehicle, based on the GAZ-4907 chassis and fitted with a collapsible AZI frame antenna, the AMU 10 m high telescopic mast, the AB-1-P/30 generator, five radio sets (one R-123MT, one R-130, two R-111 and one R-012M) as well as the TA-57 field telephone. It is also known under the designation BTR-60PU. BTR-60R-145BM-1 – Modernized model. BTR-60R-149BM – Command vehicle based on BTR-60R-145BM-1. BTR-60PZ () (1972) – Version with an improved turret similar to that on the BTR-70, which can be used to fire at flying targets. It's equipped with the 1PZ-2 roof-mounted periscope mounted on the turret. The armament has a high angle of elevation. It entered service in very small numbers. BTR-60 1V18 "Klyon-1" – BTR-60PB converted into an artillery command and forward observer vehicle, used by battery commanders of units equipped with towed artillery and MRL systems. The original turret has been replaced by an unarmed