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.
Actinic keratosis is a skin lesion. It looks like rough or scaly skin in a small patch. It is small and most often develops on skin that has had lots of ultraviolet damage â whether from the sun, tanning bed, etc. It may look bumpy and wart-like and be of various colors including pink, red, tan or brown.