Which light weight 155mm howitzer has a maximum range including 24 km (M109), 30 km (ERFB), and 40 km (Excalibur), with a maximum rate of fire of 5 rounds per minute and a sustained rate of 2 rounds per minute, and a crew of 5 enlisted?

• A. M777
• B. M109
• C. ERFB
• D. Excalibur

Answer: (A)

You’re being asked to identify a light-weight 155mm howitzer and understand how different ammunition affects its range, along with its crew and firing capability.

The light-weight option is the M777—that’s the 155mm towed howitzer designed to be air-transportable and operated by a relatively small crew. The other items listed aren’t platforms: ERFB and Excalibur are types of ammunition (Extended Range Full Bore and a GPS-guided precision round, respectively), and the M109 is a heavier, older howitzer.

The range figures line up with the ammunition types you can use with the M777: about 24 km with standard rounds, around 30 km with ERFB, and up to roughly 40 km with Excalibur. The gun’s performance is stated as a maximum rate of fire of about 5 rounds per minute, a sustained rate of about 2 rounds per minute, and a crew of five enlisted. Since the M777 is the light-weight platform capable of firing these munitions and matching the given firing characteristics, it is the correct answer.