Sopwith Pup No. N9899, nick-named "DO-DO", was flown by Flt. Sub-Lt A J Chadwick with RNAS Squadron No. 4 at Bray Dunes, France in April and May 1917. This machine had previously been assigned to both Naval 3 (where it was flown by Jimmy Glen) and Naval 8. Once it arrived at Naval 4, it was assigned to Arnold Chadwick in B Flight, who claimed his first of 5 Pup victories with it on 26 April 1917. It was later flown by several other pilots (who claimed 3 more victories in it), and eventually assigned to Naval 11, where it was written off after being run into a ditch in August 1917.

References:
Osprey Aircraft of the Aces No. 67, Sopwith Pup Aces of World War 1.
By Norman Franks, pp. 32, 40, 50-51, 54, 82, 87, 94-95.
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Still need translations (FRA, GER, SPA and RUS) for the following:"Chadwick's Sopwith Pup No. N9899, with 'DO-DO' in white on the fuselage"