Thanks for setting me straight guys.
I have indeed now oberved CMP's without observer hatches .
What can i say , i like hatches . They are like sunroofs on sports cars .
Except they are available on WW2 ,historic, fun , rare and amazingly durable trucks . Made in Canada were we can't open them because it is bloody too cold 2/3 ' of the year !
Cheers !
Robert