Question: The song "Errol" by Australian Crawl is an lyrical biography about an actor that became a U.S. citizen in what year?

Context paragraphs:
Errol Flynn: Errol Leslie Flynn (20 June 1909 – 14 October 1959) was an Australian-born American actor who achieved fame in Hollywood after 1935.  He was known for his romantic swashbuckler roles in Hollywood films, as well as frequent partnerships with Olivia de Havilland.  He became a U.S. citizen in 1942.

Australian Crawl: Australian Crawl (often called Aussie Crawl or The Crawl by fans) were an Australian rock band founded by James Reyne (lead vocals/piano), Brad Robinson (rhythm guitar), Paul Williams (bass), Simon Binks (lead guitar) and David Reyne (drums) in 1978.  David Reyne soon left and was replaced by Bill McDonough (drums, percussion).  They were later joined by his brother Guy McDonough (vocals, rhythm guitar).  The band was named after the front crawl swimming style also known as the Australian crawl.

Downhearted: "Downhearted" is the third single released by Australian surf rock band Australian Crawl from their debut album "The Boys Light Up".  The song was written by Sean Higgins, Guy McDonough and Bill McDonough.  All three songwriters had been bandmates in the Flatheads, but at the time only Bill McDonough was a member of Australian Crawl.  It was produced by David Briggs.

Errol (song): "Errol" is the second single by iconic Australian surf rock band Australian Crawl taken from their 1981 album "Sirocco".  The song was written by James Reyne and Guy McDonough, and is a lyrical biography about Australian-born actor Errol Flynn.  It was produced by Peter Dawkins.

Front crawl: The front crawl or forward crawl, also known as the Australian crawl or American crawl, is a swimming stroke usually regarded as the fastest of the four front primary strokes.  As such, the front crawl stroke is almost universally used during a freestyle swimming competition, and hence freestyle is used metonymically for the front crawl.  It is one of two long axis strokes, the other one being the backstroke.  Unlike the backstroke, the butterfly stroke, and the breaststroke, the front crawl is not regulated by the FINA.  This style is sometimes referred to as the Australian crawl although this can sometimes refer to a more specific variant of front crawl.

Company of Strangers (band): Company of Strangers were a short-lived music group from Australia.  The group consisted of Simon Hussey (Cats Under Pressure and Australian Crawl), Jef Scott (Geisha), James Reyne (Australian Crawl) and Daryl Braithwaite (Sherbet).

Guy McDonough: Guy Gillis McDonough (1955–1984) was an Australian rock musician best known for rhythm guitar and singer-songwriter with the iconic band Australian Crawl.  He provided rhythm guitar and lead vocals on two of their well-known songs, "Oh No Not You Again" and "Errol".  McDonough's solo 1985 release, "My Place", was produced by his brother, Bill McDonough.

Brad Robinson: Bradford Leigh "Brad" Robinson (1958 – 13 October 1996) was an Australian rock musician best known as lead and rhythm guitarist with the 1980s band Australian Crawl.  Robinson had a later career as a manager for musicians and sports personalities.  In 1993 Robinson was diagnosed with lymphoma and, in October 1996 when Australian Crawl were inducted into the Australian Record Industry Association (ARIA) Hall of Fame, he was hospitalised with the disease and unable to attend.  Brad Robinson died two weeks later, aged 38.

Lost &amp; Found (Australian Crawl album): Lost & Found is a compilation album of recording studio sessions credited to members of Australian Crawl and other artists; it includes tracks originally recorded with Guy McDonough and released on his 1985 posthumous solo album "My Place".  Guy McDonough had been Australian Crawl's guitarist, vocalist and songwriter from late 1980 until his death in 1984.  Former Australian Crawl drummer Bill McDonough (Guy's older brother) and producer Peter Blyton compiled, produced and mixed the tracks for "Lost & Found".

Australian Crawl discography: Australian Crawl was an Australian surf / pop rock band.  The band released four studio albums, two live albums, six compilations, seventeen singles, one extended play, and three video albums.  These include releases credited to Australian Crawl, Australian Crawl and James Reyne (but not his solo material), and 'Members of Australian Crawl'.

Supporting paragraphs: Errol (song) Errol Flynn
Answer: 1942