Editing River monitor (section)

==South America==
[[File:M_Parnaíba_(U-17).jpg|thumb|Brazilian Navy's river monitor {{ship|Brazilian monitor|Parnaíba|U17|2}}]]
The Brazilian river monitor {{ship|Brazilian monitor|Parnaíba|U17|2}} was built for the navy in [[Rio de Janeiro]] and [[Ship commissioning|commissioned]] on 9 March 1938. She participated in the [[Second World War]] and is currently the world's oldest commissioned warship still in active service.<ref>{{cite web |url=http://warisboring.com/one-of-the-worlds-oldest-military-ships-is-sailing-down-a-river-in-brazil/ |title=One of the World's Oldest Military Ships Is Sailing Down a River in Brazil |last=Beckhusen |first=Robert |date=25 May 2018 |website=warisboring.com |publisher=Bright Mountain Media |access-date=26 May 2018 |quote=In terms of operational and active ships doing military work, perhaps only the Russian salvage ship ''Kommuna'' is older... |archive-date=9 November 2020 |archive-url=https://web.archive.org/web/20201109043620/https://warisboring.com/one-of-the-worlds-oldest-military-ships-is-sailing-down-a-river-in-brazil/ |url-status=live }}</ref> She is assigned to the Brazilian navy's [[Mato Grosso]] Flotilla.