Mission of the Navy. The mission of the Navy is to maintain, train and equip combat-ready Naval forces capable of winning wars, deterring aggression and maintaining freedom of the seas. 1  What you will find here is a series of organizational charts designed to show the chain of command and the relationship of the three principal components of the Navy Department. The site map at the right demonstrates the paths you may follow. You can select the chart you wish to go to by selecting from the map.