Marines with Battery I, 3rd Battalion, 12th Marine Regiment, execute three rounds of direct fire within two minutes at targets at the Rainbow Training Area April 23. The battery was taking part in 11th Marine Regiment’s artillery competition and faced three other battalions from the regiment. - Marines with Battery I, 3rd Battalion, 12th Marine Regiment, execute three rounds of direct fire within two minutes at targets at the Rainbow Training Area April 23. The battery was taking part in 11th Marine Regiment’s artillery competition and faced three other battalions from the regiment.