Texas This category is for Military units and formations established in the 1550s. 1500s1510s1520s1530s1540s1550s1560s1570s1580s1590s1600s 11th12th13th14th15th16th17th18th19th20th21st See also: Category:Military units and formations disestablished in the 16th century Subcategories This category has the following 3 subcategories, out of 3 total. 0–9 Military units and formations established in 1556 (1 P) Military units and formations established in 1558 (1 C, 13 P) Military units and formations established in 1559 (1 C, 2 P)