FORT MCCOY, Wis. - Once upon a time, more than 1,500 Wisconsin Army National Guard Soldiers manned 54 155-mm self-propelled howitzers in three field artillery battalions - the 120th, 121st and 126th.By 2006, the 120th had converted to the smaller M119 105-mm howitzer, the 121st had converted to the Multiple Launch Rocket System and would shortly transition to the High Mobility Artillery Rocket System (HIMARS), and the 126th turned in its field artillery mission to become the 257th Brigade Support Battalion. Outside of the 426th Regional Training Institute, Wisconsin National Guard Soldiers had not fired the large cannon in nearly a decade.