What does proper foot care help prevent for soldiers?

Proper foot care is essential for soldiers as it directly contributes to their overall health and operational effectiveness. Keeping feet in good condition helps prevent a variety of foot-related issues, including fungus infections, blisters, ingrown toenails, and conditions like athlete's foot.

Fungus infections thrive in warm, moist environments, and improper foot care can create such conditions, leading to problems that can incapacitate a soldier. Blisters occur from friction and can be painful, making movement difficult. Ingrown toenails can lead to infections and severe pain, hindering a soldier's ability to perform tasks. Athlete's foot, a common fungal infection, can cause itching, burning, and peeling skin, leading to discomfort and potential distraction from duties.

While the other options do mention various health concerns, they do not directly relate to foot care as significantly as the first option does. Weight gain and muscle fatigue, for example, are more related to overall fitness and physical conditioning rather than foot maintenance. Dry skin and calluses can result from general hygiene practices, but they do not pose as immediate a threat to a soldier's performance as the conditions listed in the correct answer. Lastly, frostbite and heat rash are environmental issues and not directly related to foot care practices.