From the website:
The TCN-2000 or "Tin Can" as the Earth Force Marines call it, is a autonomous battlefield robot that assists in the support of troops with both firepower and hand to hand combat. The first TCN-2000 trial-tests were in 2031 during the Bug invasion of New Portland. The Model is all metal, multi piece and stands roughly 2.25" to the top of the head. Model comes with a 50x50mm base.