Trench foot
Trench foot can be prevented by keeping the feet clean, warm, and dry. It was also discovered in World War I that a key preventive measure was regular foot inspections; soldiers would be paired and each made responsible for the feet of the other, and they would generally apply whale oil to prevent trench foot. If left to their own devices, soldiers might neglect to take off their own boots and socks to dry their feet each day, but if it were the responsibility of another, this became less likely. Later on in the war, instances of trench foot began to decrease, probably as a result of the introduction of the aforementioned measures; of wooden duckboards to cover the muddy, wet, cold ground of the trenches; and of the increased practice of troop rotation, which kept soldiers from prolonged time at the front.
Surgical treatment of ingrown toenails
The Vandenbos procedure was first described by Vandenbos KQ and Bowers WP in 1959 in the US Armed Forces Medical Journal. They reported about 55 patients had had recurrences. Since 1988 Dr. Henry Chapeskie has performed this procedure on over 1,100 patients who had no recurrences. Unlike other procedures, the Vandenbos procedure doesn't touch the nail. In this procedure, the affected toe is anesthetized with a digital block and a tourniquet is applied. An incision is made proximally from the base of the nail about 5 mm (leaving the nail bed intact) then extended toward the side of the toe/toenail in an elliptical sweep to end up under the tip of the nail about 3–4 mm in from the edge. It is important that all the skin at the edge of the nail be removed. The excision must be adequate leaving a soft tissue deficiency measuring 1.5 × 3 cm. A portion of the lateral aspect of the distal phalanx is occasionally exposed without fear of infection. Antibiotics are not necessary as the wound is left open to close by secondary intention. Postoperative management involves soaking of the toe in warm water 3 times/day for 15–20 minutes. The wound is healed in 4–6 weeks. No cases of osteomyelitis have been reported. After healing, the nail fold skin remains low and tight at the side of the nail. 
In difficult or recurrent cases of Onychocryptosis (Ingrown Toenail) the patient's symptoms persist necessitating a permanent operative solution. The "Avulsion procedure" is simple but the surgeon must be skilled enough to accomplish total destruction, and removal of, the nail matrix. Another disadvantage is the long healing and recovery time(> 2 months). In these cases, the best method is the Syme procedure, that means total nail matrix removal + skin flap transfer + phalanx partial osteotomy + stitching.