Did a little bit of work with tone and shade on this one. Here we have the "Pug" ultralight mortar drone. It was nicknamed because it's small, ugly, and mostly useless, at least according to it's detractors.
The Pug is part of a setting I've been putting together where a supermajority of combat is done by machines, with actual soldiers considering themselves jammed together if there's more than one of them per continent, a single soldier operating several million drones simultaneously to handle combat operations across such a wide area. Soldiers write their own combat software and algorithms and guard them jealously, for having an enemy know how your machines operate means they will exploit the behaviors and guarantee your defeat.
The mining of asteroid fields has reduced the cost of raw materials to virtually nothing. The biggest expense to obtaining anything in this setting is fabrication time, effective the time and energy it costs for a printer to make it.
Actual combat is relatively rare, a huge percentage of the a battle consists of maneuvers and positioning as soldiers try to get an advantage, and quite often the battle ends in surrender when it's clear one of them has a solid advantage. The actual shooting part is usually seconds to a few minutes after hours of maneuvers.
The Pug is a treaded, ultralight support craft with positively sloppy tolerances, thin armor, and relatively simple indirect-fire weaponry. It's dimensions are approx 1 meter high, 2 wide, and 3 long, and are designed to fit stacked neatly into a standard shipping container for easy storage. Each tread mounts a forward-looking sensor while the front-mounted ammo bin does double duty with a sky-searching sensor array. It doesn't even include a steering or aiming mechanism and maneuvers entirely by changing the speed of the electric motors on it's treads, while it's mortar is fixed forward requiring it to rotate it's entire body to aim, though fortunately the mortars themselves tend to be semi-guided and make up for the Pug's lack of finesse. This allows the auto-loading mechanism to be extremely simple and also allows the Pug to burn through it's ammunition with a vastly higher rate of fire than a more complex aiming system would allow.
Armor is 2.1cm spaced honeycomb sides and rear, 2.9cm front. Ineffective at providing protection from any modern weaponry but able to provide ample protection from debris and terrain.
Armament consists of 5 Single-use pods normally loaded with anti-air missiles and a single tube high-caliber auto-mortar with 28 reloads. A Pug can fire 2 mortars each 3.75 seconds causing it to run out in 52.5 seconds. Many people have suggested that a Pug needs more ammo though those who've used it tend to laugh at that notion, it rarely manages to run out of shells before hit by a counterfire battery. Long-lived is the Pug that survives a full 30 seconds once combat is joined.
One must ask then why so many soldiers are fond of such a useless, weak excuse for a tank. The answer lies in the Pug's sloppy tolerances and the fact that it can be printed in 5 sections and quickly assembled. These two qualities let Pugs be mass-printed out of even civilian grade fabricators at high speeds and in tremendous numbers. While a single high-performance hovertank or fighter can kill vast numbers of Pugs, even
more vast numbers of Pugs and their relatively dumb ammo can be printed for the same time cost. Pugs can be crafted so quickly that some soldiers have actually managed to reinforce themselves mid-battle by suborning a city's worth of civilian garages and having their printers churn out several thousand Pugs in the space of a few minutes.