I've always loved the look and concept of the Swedish S-Tank. It's definitely a defensive weapon. You can't aim and shoot on the move as the gun is fixed solidly to the hull. Elevation and aiming is done using the tank's suspension. It's designed to dig in it's own defensive position, defend that position, then fall back or manoeuvre to a new postion and do it again. It's probaby this lack of offensive capability that made it so unappealing to any potential foreign customers.