The defense of the interplanetary space within the star system and the cubic area of space measuring 5x5x5 light–years from the star falls under the authority of HSF's Stellar Command. To accomplish this ongoing defense mission, the Stellar Command utilizes the various ships of its’ Sector Patrol Fleet (SPF). The SPF has four spacecraft classes of varying capability. These classes are the Defender-class, the Sentinel-class, the Guardian-class, and the newest class, the Protector-class. Each class is equipped with various technologies and armaments to carry out Stellar Command's defense mission. Information on each class is provided using the dropdown menu links in the navbar above, under the “Ship Classes” heading.