Question: This organization, formed in 1918, boasted Arthur C. Clarke as one of its members.

Context paragraphs:
Hate (short story): "Hate" is a science fiction short story by British writer Arthur C. Clarke, first published in 1961 and subsequently included in several collections of Clarke's writings, including "The Collected Stories of Arthur C. Clarke".  The story originated when movie producer William MacQuitty asked Clarke to write a film treatment titled "The Sea and the Stars".  Nothing came of the project so Clarke transformed the treatment into a short story.  "If" magazine retitled it "At the End of Orbit" for publication but Clarke preferred his original title because it has "more punch" and it is under that title that the story has since been published.

The Collected Stories of Arthur C. Clarke: The Collected Stories of Arthur C. Clarke, first published in 2001, is a collection of almost all science fiction stories written by Arthur C. Clarke: it includes 114 in all arranged in order of publication, "Travel by Wire! " in 1937 through to "Improving the Neighbourhood" in 1999.  The story "Improving The Neighbourhood" has the distinction of being the first fiction published in the journal "Nature".  The titles "Venture to the Moon" and "The Other Side of the Sky", are not stories but the series titles for groups of six interconnected stories, each story with its own title.  This collection is missing several stories, for example "When the Twerms Came" which appears in his other collections "More Than One Universe" and "The View from Serendip".  This edition contains a foreword by Clarke written in 2000, where he speculates on the science fiction genre in relation to the concept of short stories.  Furthermore, many of the stories have a short introduction about its publication history or its literary nature.

Rescue Party: "Rescue Party" is a short story by Arthur C. Clarke, first published in "Astounding Science Fiction" in May 1946.  It was his first story that he sold, though not the first actually published.  It was republished in Clarke’s second collection, "Reach for Tomorrow", and also appears in "The Collected Stories of Arthur C. Clarke".

Crusade (short story): "Crusade" is a short story by English writer Arthur C. Clarke published in 1968 and republished in" The Wind from the Sun "as well as" The Collected Stories of Arthur C. Clarke".

Royal Air Force: The Royal Air Force (RAF) is the United Kingdom's aerial warfare force.  Formed towards the end of the First World War on 1 April 1918, it is the oldest independent air force in the world.  Following victory over the Central Powers in 1918 the RAF emerged as, at the time, the largest air force in the world.  Since its formation, the RAF has taken a significant role in British military history, in particular, playing a large part in the Second World War where it fought its most famous campaign, the Battle of Britain.

E02 expressway (Sri Lanka): The Colombo Outer Circular Expressway (also known as the Outer Circular Highway(OCH), Colombo Inter-provincial Orbital Router or the Arthur C. Clarke Expressway) is a highway in Colombo, Sri Lanka.  It was opened in sections, with the latest one between Kaduwela and Kadawatha having been opened on 17 September 2015.  The 29 km long outer circular road network links the Colombo - Matara Expressway with Colombo - Katunayake Expressway and the proposed Colombo - Kandy Expressway and will provide an orbital beltway to bypass the city of Colombo and reduce traffic congestion.  The project is funded by the Japan International Cooperation Agency (JICA) The expressway is named "Arthur C. Clark Expressway" in honor of Arthur C. Clarke, a famous science fiction writer and futurist who lived in Sri Lanka from 1956 to his death in 2008.

Arthur C. Clarke's Mysterious Universe: Arthur C. Clarke's Mysterious Universe was a popular 26-part television series looking at unexplained phenomena across the universe.  It was first broadcast in the United Kingdom by independent television network Discovery Channel.  It premiered on 15 July 1994.  It was the sequel to "Arthur C. Clarke's Mysterious World" and "Arthur C. Clarke's World of Strange Powers".

More Than One Universe: More Than One Universe: The Collected Stories of Arthur C. Clarke is a collection of science fiction short stories by Arthur C. Clarke originally published in 1991.

When the Twerms Came: "When the Twerms Came" is a short story by British author Arthur C. Clarke published in the May 1972 edition of "Playboy" magazine.  It deals with an invasion of Earth one wet Tuesday afternoon by deadly Twerms and was published in book form in "The View from Serendip" and "More Than One Universe" collections, but was not included in the "The Collected Stories of Arthur C. Clarke".

Glide Path: Glide Path is a novel by Arthur C. Clarke, published in 1963.  Clarke's only non-science fiction novel, it is set during World War II, and tells a fictionalized version of the development of the radar-based ground-controlled approach (called "ground-controlled descent" in the novel) aircraft landing system, and includes a character modeled on Luis Alvarez, who developed this system.  It is based on Clarke's own wartime service with the Royal Air Force, during which he worked on the GCA project.

Supporting paragraphs: Glide Path Royal Air Force
Answer: Royal Air Force