Well, we currently have All-New Invaders, a book featuring a group of heroes originally active back in World War II, but currently set in the present.
The group was first officially named and formed back in 1975, but had their existence in Marvel Comics stories retconned to earlier than that.
But now my question (and I don't know how much the answer may be determined in part by how old people who vote are): When do you prefer your Invaders adventures to take place?
I personally prefer adventures set during World War II, but I admit I'm older and may have more appreciation for that time because my father was in the army back then. Are people who are younger maybe not really interested in those times?