Attack on Titan: Before the Fall Vol 16

From the Kodansha edition

The prequel to the number one bestselling Attack on Titan and winner of the Diamond Gem Award for best manga continues! DOWN IN THE MUD At last, the fateful day of the expedition arrives. If the Survey Corps doesn't use its newfangled maneuvering equipment to bring back evidence of a dead Titan, then humanity's best (and only) option for fighting back will be dismantled forever! The team of untested young recruits only has one shot, and they have to make it count--but the conditions are poor, and there are dark clouds on the horizon...

Source: Penguin Random House API