structural:reformatting, stylistic:tone
Symbols

The oak is a widely used symbol of strength and endurance. It is the national tree of many countries, including the US, Bulgaria, Croatia, Cyprus (golden oak), Estonia, France, Germany, Moldova, Jordan, Latvia, Lithuania, Poland, Romania, Serbia, and Wales. Ireland's fifth-largest city, Derry, is named for the tree, from Irish: Doire, meaning ' oak '. Oak branches are displayed on some German coins, both of the former Deutsche Mark and the euro. Oak leaves symbolize rank in armed forces including those of the United States. Arrangements of oak leaves, acorns, and sprigs indicate different branches of the United States Navy staff corps officers. The oak tree is used as a symbol by several political parties and organisations. It is the symbol of the Conservative Party in the United Kingdom, and formerly of the Progressive Democrats in Ireland.