Justice League International v01 - The Signal Masters (2012)

A New York Times Bestseller
As a part of the acclaimed DC Comics--The New 52 event of September 2011, the United Nations brings together Batman, Booster Gold, Green Lantern Guy Gardner, August General in Iron, Fire, Ice, Vixen and Rocket Red-a new group called Justice League International!
With the growing presence of super beings around the world, the JLI are charged with promoting unity and trust-but if they're going to discover the mystery behind the giant alien Signalmen who are appearing all over the globe can they reach that goal without killing each other first? Collects (2011-2012) #1-6