[BO] Anyone ever noticed the fire in every first missions in campaigns within the Black Ops series?

Does anyone else ever noticed that every Black Ops first mission starts with a fire? Like:

BO1 = lighter strikes fire

BO2 = fire from the truck (that mason was trying to save that Savimbi's man trapped within the unbreakable window)

BO3 = Fire from a truck, of which the player observes in a monitor of some sort(?)

BO4 = non-existent campaign whatsoever

BOCW = same as BO1, lighter strikes fire

BO6 = fire from the oil rigs in Kuwait

What else could that mean?? Or is it that Treyarch just decided that ever since BO1 it was so iconic to just start every first mission with a fire?

Also now that i mentioned it, Treyarch did mention BO4 was not going to have any campaign, so i think we can scratch BO4 off from the campaign list.