What challenges do machine gunners face in extreme weather conditions?

Machine gunners face several challenges in extreme weather conditions, and one of the primary issues is that ammunition performance can indeed be affected. In cold weather, for instance, the viscosity of propellants may change, which can lead to inconsistent firing and possibly misfires. In hot and humid conditions, moisture can seep into ammunition, causing it to corrode, swell, or otherwise malfunction. Additionally, extreme temperatures can impact the reliability and accuracy of the ammunition, affecting the overall effectiveness of the machine gun.

On the other hand, the other options do not accurately reflect the challenges faced. Increased mobility and speed are generally not associated with adverse weather conditions and are more likely to be hindered rather than enhanced. Minimal impact on operations is misleading, as extreme weather conditions can significantly disrupt tactical maneuvers and weapon effectiveness. Lastly, claiming that there is improved weapon effectiveness contradicts the reality that adverse weather typically challenges operational readiness and weapon performance. Thus, the concern regarding ammunition performance in extreme conditions is a vital aspect for machine gunners to consider in their operational planning and execution.