The M107 self-propelled howitzer hasn't gotten much attention. The M109 series of 155mm howitzers, on the other hand, is reaching its 55th year in operational service with the United States Army. Meanwhile, the M107 is fading into obscurity. Despite its (lack of) reputation, this howitzer was crucial for both the United States and Israel, among other nations.
The M107 and M110 shared the same chassis, but both were equipped with different guns — the M107 packed a 175mm gun and the M110 used an eight-inch cannon. Sharing a chassis was a boon in terms of both maintenance and logistics, since it meant the supply clerks had fewer categories of parts to handle.
A M107 self-propelled gun reaches out to touch the enemy during a fire mission in South Vietnam.
That also meant the guns were swappable — a M107 could become a M110 and vice versa depending on the mission. Want to deliver a particularly big punch? The M110 was your choice. Need to reach out and touch someone up to 25 miles away? The M107 is your choice for that.
The M107 entered operational service with the United States Army in 1962. By 1979, it had been retired, but it served for a while in a number of other militaries. Its most notable service was with Israel, which pushed its maximum range to 30 miles thanks to the efforts of Dr. Gerald Bull. M107s shelled Damascus during the Yom Kippur War, destroyed at least 15 surface-to-air missile sites, and are still held in reserve by the Israeli military.
The Israelis were able to use M107 to hit targets up to 30 miles away.
The M107 also saw action in the Iran-Iraq War, where it was used by Iranian forces. The M107 was first replaced by the M110A2, a longer-range eight-inch gun, and, ultimately, by the M270 Multiple Launch Rocket System.
You can see how the Army introduced this long-range gun to America in the video below!