by SlamBurger » Tue Jan 19, 2010 10:22 pm
From the Marvel page:
"Avengers membership proved very fluid over the years. Thor, Iron Man, Pym and Wasp would all return for further tours of duty, though the unstable Pym did so in a series of alternate identities as Giant-Man, Goliath (an identity also used temporarily by Hawkeye), Yellowjacket and Doctor Pym. The four returning founders would all serve stints as team leader, too, and the group produced a series of impressive leaders over the years, notably Captain America, Wasp, Hawkeye and Iron Man."