18B Mortar Employment & 81mm Practice Test 2026 - Free Mortar Employment Practice Questions and Study Guide

The sustained rate of fire for the M252 mortar is set at 15 rounds per minute (rpm). This rate is designed to provide a balance between effective fire support and maintaining the barrel's temperature to prevent overheating. The sustained rate is different from the maximum rate of fire, which is typically higher but not sustainable for long durations without risking equipment damage or reduced accuracy.

In this context, knowing the sustained rate of fire is critical for planning operations that require consistent and effective fire support over extended periods. It allows mortar teams to effectively coordinate their shooting, manage ammunition supplies, and ensure that they can maintain a high level of readiness while being mindful of the physical limits of the mortar system.