These tanks of Bangladesh army have gone through major upgrades. The upgrades include ERA, 125mm gun, new engine and a host of other equipment. They will remain in service for about 10-15 years. After that time, new tanks will have to be procured probably from China.
The first picture was taken when Bangladesh army was stationed in the Middle East in 1990. The second and third pictures show BTR-80 APC which are in service with Bangladesh army.