been derived from the AH-64A, AH-64D and AH-64E for export. The British-built AgustaWestland Apache (assembled from kits purchased from Boeing) is based on the AH-64D Block I with several different systems, including more powerful engines, folding rotor blades, and other modifications for operation from Royal Navy vessels. Block modification While a major change in design or role will cause the type designator suffix to change, for example from AH-64D to AH-64E, the helicopters are also subject to block modification. Block modification is the combining of equipment changes into blocks of modification work orders, the modifications in the block (sometimes called a block package) are all done to the helicopter at the same time. Operators Egyptian Air Force – 46 AH-64Ds Hellenic Army – 28 AH-64A/Ds Indian Air Force – 22 AH-64Es in inventory as of July 2020 Indian Army – 6 AH-64Es on order Indonesian Army 8 AH-64Es Israeli Air Force – 48 AH-64A/Ds Japan Ground Self-Defense Force – 12 AH-64D In December 2022, the Japanese government decided to replace 12 AH-64D, 47 AH-1S, 33 OH-1, and 26 U-125A with unmanned aerial vehicles. Japan plans to increase its defense budget from 1.24% of GDP in fiscal 2021 to around 2.0% within 10 years, and has decided to retire these helicopters and aircraft as part of an effort to spend its defense budget efficiently. Kuwait Air Force – 24 AH-64Ds Royal Moroccan Air Force – 36 AH-64Es on order Royal Netherlands Air Force – 28 AH-64Ds Qatar Emiri Air Force – 24 AH-64Es Royal Saudi Land Forces – 47 AH-64A/D/Es Saudi Arabia National Guard – 12 AH-64Es Republic of Singapore Air Force – 19 AH-64Ds Republic of Korea Army – 36 AH-64Es Republic of China Army – 29 AH-64Es United Arab Emirates Air Force – 28 AH-64D/Es See also AgustaWestland Apache – 67 United States Army – 1,891 AH-64D/Es Specifications (AH-64A/D) Notable appearances in media See also References Notes Citations Bibliography Bernstein, Jonathan. AH-64 Apache units of operations: Enduring Freedom and Iraqi Freedom. Oxford: Osprey Publishing, 2005. . Bishop, Chris. Apache AH-64 Boeing (McDonnell Douglas) 1976–2005. Osprey Publishing, 2005. . Donald, David. "AH-64A/D Apache and AH-64D Longbow Apache". Modern Battlefield Warplanes. AIRtime Publishing Inc, 2004. . Feldman, Shai. The Middle East Strategic Balance, 2003–2004. Sussex Academic Press, 2004. . Fisk, Robert. The Great War for Civilisation: The Conquest of the Middle East. Fourth Estate, 2005. Government Accounting Office. Staff Study: Advanced