Original sentence: - Used BTR-50PK but withdrew them from service, only 70 BTR-50PUM1 and BTR-50YVI left
Edited sentence: - 31 ordered in 1969 from the Soviet Union and delivered between 1969 and 1970.Used BTR-50PK but withdrew them from service, only 70 BTR-50PUM1 and BTR-50YVI left