What is the sustained rate of fire for the M252 mortar?

The sustained rate of fire for the M252 mortar is indeed 15 rounds per minute indefinitely. This specification indicates the mortar's operational capability to maintain this rate without an overheating issue or a significant drop in performance over time. Sustained fire is crucial for maintaining suppressive fire on a target area, allowing for a continual barrage that can deter enemy forces or support ground troops effectively.

The choice of 15 rounds per minute reflects a balance between operational tempo and ensure that the soldier crews can manage consistency and safety in their firing operations. This allows adequate time for reloading, aiming, and making necessary adjustments while still delivering effective firepower over extended periods.

In contrast, the other options indicate either a higher rate of fire than is sustainable or specify time limits that do not apply to the M252 mortar’s capability. For example, rates of 20 rounds per minute for 10 minutes or 30 rounds per minute indefinitely would exceed the design limitations of the mortar and could lead to overheating or mechanical failure under prolonged use. Therefore, the correct understanding of the M252's capabilities is essential for effective operational planning and execution.