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. Skin cancers -- including melanoma, basal cell carcinoma, and squamous cell carcinoma -- often start as changes to your skin. They can be new growths or precancerous lesions -- changes that are not cancer but could become cancer over time. mole (nevus) is a benign growth of melanocytes, cells that gives skin its color. Although very few moles become cancer, abnormal or atypical moles can develop into melanoma over time. Normal moles can appear flat or raised or may begin flat and become raised over time. The surface is typically smooth.