Liberation Army Navy took delivery of China's first aircraft carrier, the Liaoning. The 60,000-ton ship can accommodate 33 fixed wing aircraft. It is widely speculated that these aircraft will be the J15 fighter (the Chinese version of Russia's SU-33). In September 2015, satellite images showed that China may have started constructing its first indigenous Type 002 aircraft carrier. At the time, the layout suggested to be displacement of 50,000 tons and a hull to have a length of about 240 m and a beam of about 35 m. The incomplete bow suggests a length of at least 270 m for the completed hull. In April 2017 the carrier was launched. Japan has raised concerns about the PLAN's growing capability and the lack of transparency as its naval strength keeps on expanding. China has reportedly entered into service the world's first anti-ship ballistic missile called DF-21D. The potential threat from the DF-21D against U.S. aircraft carriers has reportedly caused major changes in U.S. strategy. In June 2017 China launched a new type of large destroyer, the Type 055 destroyer. The new destroyer is, with its dimension of 180 meter and over 12,000 tons fully loaded, the second largest destroyer class in the world after the American Zumwalt-class destroyer. Comparison to US Navy The strength of PLAN is often compared to that of the US Navy. PLAN is the second largest navy in the world in terms of tonnage which stands at 1,820,222 tonne as of 2019, only behind the United States Navy. PLAN has the largest number of major surface combatants of any navy globally with an overall battle force of approximately 350 surface ships and submarines — in comparison, the United States Navy's battle force is approximately 293 ships. Attempts have been made to compare PLAN's firepower with the USN. A 2019 review found the USN fleet was able to deploy more "battle force missiles" (BFMs), defined as those missiles that contribute to battle missions, than the PLAN: USN fleet could deploy 11,000 BFMs, compared to 5250 BFMs for PLAN and 3326 BFMs for the Russian Navy. A 2016 review concluded that PLAN's missiles had higher firepower than the USN's, measured in terms of "strike-mile", the ability to delivery a warhead using anti-ship missiles (ASM) across a given distance. The review used the following formula for every ASM the navy had in its inventory: Total strike-miles=(Range of an ASM x