The Smith and Wesson Model 22 series is a refined commercial version of a U.S. six-shot revolver of .45 ACP caliber adopted by the U.S. Army in 1917 durring what war?
World War I
Title: Smith &amp; Wesson Model 10
Passage: The Smith & Wesson Model 10, previously known as the Smith & Wesson .38 Hand Ejector Model of 1899, the Smith & Wesson Military & Police or the Smith & Wesson Victory Model, is a revolver of worldwide popularity.  It was the successor to the Smith & Wesson .32 Hand Ejector Model of 1896 and was the first Smith & Wesson revolver to feature a cylinder release latch on the left side of the frame like the Colt M1889.  In production since 1899, it is a six-shot double-action revolver with fixed sights.  Over its long production run it has been available with barrel lengths of 2 in (51 mm), 3 in (76 mm), 4 in (100 mm), 5 in (130 mm), and 6 in (150 mm).  Barrels of 2.5 inches (64 mm) are also known to have been made for special contracts.  Some 6,000,000 of the type have been produced over the years, making it the most popular centerfire revolver of the 20th century.
Title: M1917 revolver
Passage: The M1917 Revolver (formally United States Revolver, Caliber .45, M1917) was a U.S. six-shot revolver of .45 ACP caliber.  It was adopted by the U.S. Army in 1917 to supplement the standard M1911 .45 ACP semi-automatic pistol during World War I. Afterwards, it was primarily used by secondary and non-deployed troops.  There were two variations of the M1917, one made by Colt and the other made by Smith & Wesson.
Title: Smith &amp; Wesson Model 22
Passage: The Smith & Wesson Model 22 series of revolvers is a refined, commercial version of the M1917 revolver issued during World War I.
Smith &amp; Wesson Model 22 M1917 revolver