Avengers: The Initiative (2007) #15
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Earth's Mightiest Heroes joined forces to take on threats that were too big for any one hero to tackle. With a roster that has included Captain America, Iron Man, Ant-Man, Hulk, Thor, Wasp and dozens more over the years, the Avengers have come to be regarded as Earth's No. 1 team.
U.S. Air Force pilot and Tony Stark's friend who has his own suit of Iron Man armor, nicknamed, "War Machine."
<span style="color: #333333; font-family: &amp;amp; font-size: 14.4px; letter-spacing: normal; line-height: normal; background-color: #eeeeee;">U.S. Air Force pilot and Tony Stark's friend who has his own suit of Iron Man armor, nicknamed, "War Machine."</span>
After brilliant scientist Henry Pym discovered a process in which he could manipulate a newly discovered group of subatomic particles through magnetic fields, he tested the serums on himself and accidentally shrunk himself to the size of an ant.