引用・参考文献 https://www.quora.com/Can-attack-helicopters-be-refueled-in-midairhttps://www.pacom.mil/Media/Photos/igphoto/2002249348/https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/3405717/helicopter-aerial-refueling/
http://www.nicovideo.jp/watch/sm46075746
