to "technical failures or poor maintenance", with a failure rate per hour flown over 100 times higher than the F-16 fighter. Northrop Grumman stated that it was unfair to compare the failure rates of a mature design to that of a prototype aircraft. In June 2012, a media report described the Global Hawk, the General Atomics MQ-1 Predator and the MQ-9 Reapers "... the most accident-prone aircraft in the Air Force fleet." On 11 February 2010, the Global Hawks deployed in the Central Command AOR accrued 30,000 combat hours and 1,500 plus sorties. Initial operational capability was declared for the RQ-4 Block 30 in August 2011. The USAF did not plan to keep the RQ-4B Block 30 in service past 2014 due to the U-2 and other platforms being less expensive in the role. Congress sought to keep it in service until December 2016. The USAF had 18 RQ-4 Block 30s by the time of the passage of the National Defense Authorization Act for Fiscal Year 2013, which directed a further three RQ-4s to be procured as part of Lot 11. The USAF felt that additional aircraft were "excess to need" and likely become backup or attrition reserve models. Despite the potential retirement of the Block 30 fleet due to low reliability, low mission readiness, and high costs, the USAF released a pre-solicitation notice in September 2013 for Lot 12 aircraft. In planning the USAF's FY 2015 budget, the Pentagon reversed its previous decision, shifting $3 billion from the U-2 to the RQ-4 Block 30, which had become more competitive with the U-2 due to increased flying hours. Factors such as cost per flight hour (CPFH), information gathering rates, mission readiness, adverse weather operational capability, distance to targets, and onboard power still favored the U-2. After the 2011 Tōhoku earthquake and tsunami, RQ-4s flew 300 hours over the affected areas in Japan. There were also plans to survey the No. 4 reactor at the Fukushima Daiichi Nuclear Power Plant. By November 2012, Northrop Grumman had delivered 37 Global Hawks to the USAF. By March 2014, 42 Global Hawks were in use around the world, with 32 in use by the USAF. The USAF stated that U-2 pilot and altitude advantages allow better functionality in the stormy weather and airspace restrictions of the East Asia region and its altitude and sensor advantages allow it to see further into hostile territory. In