You Don't Assign Him A Giant Monster, You Just Turn Him Loose is the fourth issue of Godzilla: Ongoing. It was released on August 29, 2012.
"Unable to take down Titanosaurus on their own, Boxer and the Monster Kill Crew decide to fight monster with monster! After luring Rodan to the battlefield, the Crew is hoping for a two-for-one score. But in a world of kaiju, things seldom go as planned! Plus, the Crew starts to ask the big question: Why are the monsters reappearing now? They might not like the answer!"
SPOILER WARNING: This section may contain major plot and/or ending details. Proceed at your own discretion.