A powerless GL is separated from the others and meets Sgt. Rock and Easy Co. They head into enemy territory to find a hidden runway while Superman, Flash, and Hawkgirl manage to destroy the German defense with the aid of the expatriate airmen known as the Blackhawks. J'onn finds out Vandal Savage is getting information and technology from his future self. Wonder Woman aids Steve Trevor to gain a communication device they need to intercept German transmissions. They break into prison only to find its a trap as the Germans close in.
The Blackhawks have been around since 1941 in Quality Comics, which DC later picked up in '56. They've been around for a while (even had a movie serial in 1952), typically showing up when DC wants to do some WW2 stuff, and have undergone a revision or two. Currently I think they run a government delivery service. Not too surprisingly, the version here lost Chop-Chop, who had the worst Chinese dialogue this side of Dr. Egg Foo Yung (don't ask).
Sgt. Rock & Easy Company
Sgt. Rock is another of DC's line of war heroes created by Robert Kanigher and initially penned by Joe Kubert. An everyman soldier, Rock led the men of Easy Company, each one of which he gave a particular nickname to capture their essence (and many who died over the years). Rock was originally intended to be only a soldier who was killed by the last bullet fired in WW2, but like most comic-book characters the parent company felt the need to bring him into the present, upgrade him, etc. Recently DC made him "General Rock", established he was still alive in the modern day (maybe...), and had him and Bulldozer appear working for President Lex Luthor and leading a modern-day incarnation of the Suicide Squad.