Becasue we're running out of room and in game terms the An-12 has the maximum capacity the game engine allows ( 255 ) '2' indicates it can load vehicles and 255 is the largest number allowed. That's why the Il-76's in other OOB's are 190( there are no Il-76 in the Indian OOB but there are in Iran, Iraq and Algeria ) 190 allows no vehicles but it does guns and it allows up to 90 points of carry capacity