The BMP-1 is a Soviet amphibious tracked infantry fighting vehicle. BMP stands for Boyevaya Mashina Pekhoty 1 (Russian: Боевая Машина Пехоты 1; БМП-1), meaning "infantry fighting vehicle". The BMP-1 was the world's first mass-produced infantry fighting vehicle (IFV). It was called the M-1967, BMP and BMP-76PB by NATO before its correct designation was known.
The BMP-1 is a considerably cheap unit, however, its weaponry is not very efficient due to accuracy problems, while it can bring numbers and morale damage due massed ATGMs and cannon fire it will be unlike to see them scoring killing points unless facing very light units.
The BMP-1s may work decently as screens and meat shields for expensive units, as they are slightly more resilient than BTR-60AIs and have more speed than other candidates for cannon fodder.
While cheap when compared to other units BMP-1s are still more expensive than standard infantry and some transports, so, be careful of not wasting them without any real tactical advantage as compensation.
BMP-1s do not have any anti-air defense, not even machine-guns, so it is important to give them some AA backup as they might get slaughtered in mass by a single copter with an autocannon.
Mechanized infantry tactics during the 1950s were similar to World War II methods in which APCs were used as "battle taxis"; they brought their infantry up to the front line where they then dismounted and fought on foot while the APC retreated to safer areas. BMP-1 were the first Infantry Fighting Vehicles to enter service. BMP-1 and their counterparts in other countries were designed to fight along side their infantry passengers and supporting armor. The BMP-1 first saw combat in the 1973 Yom Kippur War with both Egyptian and Syrian forces.