World War II: San Marino, a neutral state, is mistakenly bombed by the RAF based on faulty information, leading to 35 civilian deaths.

The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS). Following the Allied victory over the Central Powers in 1918, the RAF emerged as the largest air force in the world at the time. Since its formation, the RAF has taken a significant role in British military history. In particular, it played a large part in the Second World War where it fought its most famous campaign, the Battle of Britain.The RAF's mission is to support the objectives of the British Ministry of Defence (MOD), which are to "provide the capabilities needed to ensure the security and defence of the United Kingdom and overseas territories, including against terrorism; to support the Government's foreign policy objectives particularly in promoting international peace and security". The RAF describes its mission statement as "... [to provide] an agile, adaptable and capable Air Force that, person for person, is second to none, and that makes a decisive air power contribution in support of the UK Defence Mission". The mission statement is supported by the RAF's definition of air power, which guides its strategy. Air power is defined as "the ability to project power from the air and space to influence the behaviour of people or the course of events".Today, the Royal Air Force maintains an operational fleet of various types of aircraft, described by the RAF as being "leading-edge" in terms of technology. This largely consists of fixed-wing aircraft, including those in the following roles: fighter and strike, airborne early warning and control, intelligence, surveillance, target acquisition, and reconnaissance (ISTAR), signals intelligence (SIGINT), maritime patrol, air-to-air refuelling (AAR) and strategic & tactical transport. The majority of the RAF's rotary-wing aircraft form part of the tri-service Joint Helicopter Command in support of ground forces. Most of the RAF's aircraft and personnel are based in the UK, with many others serving on global operations (principally over Iraq and Syria) or at long-established overseas bases (Ascension Island, Cyprus, Gibraltar, and the Falkland Islands). Although the RAF is the principal British air power arm, the Royal Navy's Fleet Air Arm and the British Army's Army Air Corps also operate armed aircraft.

San Marino ( (listen), Italian: [sam maˈriːno]), officially the Republic of San Marino (Italian: Repubblica di San Marino; Romagnol: Ripóbblica d' San Marein), also known as the Most Serene Republic of San Marino (Italian: Serenissima Repubblica di San Marino), is a small country (and a European microstate) in Southern Europe enclaved by Italy. Located on the northeastern side of the Apennine Mountains, San Marino covers a land area of just over 61 km2 (24 sq mi), and has a population of 33,562.San Marino is a landlocked country but the northeastern end is within 10 kilometres (6.2 mi) of the Italian city of Rimini on the Adriatic Sea. The nearest airport is also in Italy. The country's capital city, the City of San Marino, is located atop Mount Titan, while its largest settlement is Dogana within the largest municipality of Serravalle. San Marino's official language is Italian.

The country derives its name from Saint Marinus, a stonemason from the then-Roman island of Rab in present-day Croatia. Born in AD 275, Marinus participated in the rebuilding of Rimini's city walls after their destruction by Liburnian pirates. Marinus then went on to found an independently ruled monastic community on Mount Titan in AD 301; thus, San Marino lays claim to being the oldest extant sovereign state, as well as the oldest constitutional republic.Uniquely, San Marino's constitution dictates that its democratically elected legislature, the Grand and General Council, must elect two heads of state every six months. Known as captains regent, the two heads of state serve concurrently and hold equal powers until their term expires after six months.

The country's economy is mainly based on finance, industry, services and tourism. It is one of the wealthiest countries in the world in GDP per capita, with a figure comparable to the most developed European regions.