been retired. Europe Greece After protracted negotiations the Hellenic Air Force ordered the F-16 in 1985. FMS program PEACE XENIA was begun with delivery of 40 F-16C/D Block 30 aircraft in 1989 and 1990. This was followed by an order for 40 F-16C/D Block 50 fighters, delivered in 1997 and 1998. In June 2000 a further order for 50 F-16C/D Block 52+ aircraft was made with an option of 10 more fighters, exercised in September 2001. All 60 aircraft (40 C-model aircraft and 20 missionized D-model) were delivered by June 2004. In December 2005 the Greek government signed an LOA for the delivery of 30 additional F-16C/D Block 52M with a not exercised option on 10 more. The latest batch consists of 20 C-models and 10 D-models, while deliveries were completed in 2009. On 28 April 2018, Greece decided to upgrade 85 of its F-16 to the F-16V standard. On 17 January 2021, Hellenic Aerospace Industry (HAI) upgraded first F-16C to the latest F-16V standard. The Hellenic Aerospace Industry (HAI) will upgrade 12 F-16 to the latest F-16V standard per year. Units: 330 Squadron "Thunderbolt" F-16C/D Block 30 335 Squadron "Tiger" F-16C/D Block 52+ Advanced 337 Squadron "Ghost" F-16C/D Block 52+ 340 Squadron "Fox" F-16C/D Block 52+ 341 Squadron "Arrow" F-16C/D Block 50 343 Squadron "Star" F-16C/D Block 52+ 346 Squadron "Jason (Iason)" F-16C/D Block 30 ( Disbanded ) 347 Squadron "Perseus" F-16C/D Block 50 Poland One of the former members of the Warsaw Pact that was looking to replace an aging fleet of Soviet-built Mikoyan-Gurevich MiG-23 (withdrawn in service in 1999 due to their small numbers and uneconomical operation) and the Mikoyan-Gurevich MiG-21 fighters (withdrawn from service in 2003), Poland conducted a competition between the Mirage 2000-5 Mk.2, the JAS 39 Gripen, the Mikoyan-Gurevich MiG-29 (the last offer was withdrawn), and the F-16 Fighting Falcon. Despite a strong challenge by the BAe/SAAB team, Poland purchased 48 F-16C/D-52+ aircraft. The aircraft were delivered from 2006 under the PEACE SKY program, to avoid confusion with the PZL W-3 Sokół (Polish language "Falcon") helicopter, these jet fighters were nicknamed the F-16 Jastrząb (Goshawk) in Polish. Now, the F-16, along with 32 Mikoyan-Gurevich MiG-29 fighters and 48 Sukhoi Su-22 ground attack aircraft are the main offensive strike force for Polish Air Force. There have also been delays in the offset program, the United States has not made all the promised investments in Poland