 In 2012, a Navy cybersecurity team found major deficiencies in Lockheed's Total Ship Computing Environment, which controls the entire ship in order to reduce crewing requirements.Survivability has been a criticism of both Littoral Combat Ship classes, rated at level one by the Navy, compared to level two for the guided-missile frigates (FFG) they were designed to replace.Lockheed claims the "Freedom" class is actually more survivable than the FFGs because Navy requirements for various survivability levels have changed since the FFGs were assessed, and because the "Freedom"s hull is made of high-strength, low-weight steel that was not previously available.