The Department of Defense is headed by a civilian; the Secretary of Defense, who is appointed by the President of the United States. Under the Secretary of Defense, there are three military departments: The Department of the Army, the Department of the Air Force, and the Department of the Navy. 1  Each of these military departments are also headed up by civilians; the Secretary of the Army, the Secretary of the Air Force, and the Secretary of the Navy.
Melanoma is not as common as other types of skin cancer, but it's the most serious and potentially deadly. Possible signs of melanoma include a change in the appearance of a mole or pigmented area.
The warning signs of skin cancer. Like many cancers, some skin cancers â such as melanoma and squamous cell carcinoma â start as precancerous lesions. These precancerous lesions are changes in skin that are not cancer but could become cancer over time. The NHS says skin cancer affects more than 100,000 people in the UK each year. Learn to spot the early warning signs. Skin cancer can be cured if it's found and treated early.