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From the First Resource War to the 29th Throne Succession War, the phrase "We have plenty of Zest" implies endurance amidst the harshness of life, to laugh in the face of hardship. To the average Lemonian General, that also means driving a few hundred thousand Zests into battle to wash the front-line with cannon and steel.
The Zest Harvester-Tank is the Main Battle Tank of the Lemonian Army. All those under the Kingdom is entitled to own one of these for free as their first workhorse. Built to last, well-armed and well-equipped to withstand the harsh, unruly terrain of extraterrestrial planets, it's been well-documented as a family heirloom in some places, and large enough to build a small house on.
As a combat vehicle, it does not disappoint; Megaton Cannons make short work of Techs not built for war. The same drills it uses to harvest trees and ores alike can be used to shred Techs to nothing and its mortars bombard structures to dust. Experienced soldiers can request modifications to their tank, commonly by replacing its resource silos with more guns or mortars, or replacing the treads with faster ones.