High Quality Content by WIKIPEDIA articles! Raad-2 ("Thunder-2") is an Iranian self-propelled howitzer. In early September 1997 it was reported that Iran had successfully tested a locally built rapid fire mobile field gun known as Raad-2 (Thunder-2). It uses a turret that has a similar layout to the M109A1 155mm/39-cal self-propelled howitzer. The Iranian Defense Industries Organization claimed that the 155 mm HM44 howitzer manufactured by the Hadid facility of the Iranian Defense Industries Organization had a high firing rate and accuracy. It was described as being able to fire five rounds per minute.