** First Intermediate Period: 22nd to 21st centuries BC

** Middle Kingdom of Egypt: 21st to 17th centuries BC

** Thomas Hendricks, 21st Vice President of the United States ( b. 1819 )

** The Blaine Act passes the United States Senate, submitting the proposed 21st Amendment to the Constitution to the states for ratification.

** Ulysses S. Grant graduates from West Point 21st from a class of 39.

** Adnan Menderes of DP forms the new government of Turkey ( 21st government )

** Henry Trevor, 21st Baron Dacre, British peer and soldier ( b. 1777 )

** Henry Trevor, 21st Baron Dacre, British peer and soldier ( d. 1853 )

** 2011: Michael Winterbottom 21st century Indian set film Trishna with Freida Pinto and Riz Ahmed.

** 5th, 12th, 16th, 20th, 21st Dragoon Regiments.

** 10th Hussar, 21st Chasseur, 13th and 22nd Dragoon Regts.

** 13: Parentatio, with appeasement of the Manes beginning at the 6th hour and ceremonies performed by the chief Vestal ; temples were closed, no fires burned on altars, marriages were forbidden, magistrates took off their insignia, until the 21st

** 2nd Brigade – Colonel E. P. Pearson, consisting of the 2nd, 10th, and 21st U. S. Infantry Regiments

** Dalian ( 21st )

** Challenger 1 tank, in service from the late 1980s to early 21st century

** 21st Fighter Division

** 21st Independent Parachute Company Army Air Corps

** Field Marshal Sir Bernard Law Montgomery ( 21st Army Group )

** 21st Anti-Tank Regt ( Q, Y, Z & BB Batteries )

** 3rd Battalion, 21st Infantry Regiment

** 1st Battalion, 21st Infantry Regiment

** 21st Field Park Company, SA Engineering Corps

** Panzerbrigade 21 ( 21st Armoured Brigade " Lipperland ")

** Mercury: Site of Project: Springboard during the 21st century.

** Accompanying B-29 Superfortresses, P-51 Mustangs of the U. S. Army Air Forces 15th, 21st, and 506th Fighter Groups based on Iwo Jima become the first Allied fighters to escort bombers all the way to Tokyo, Japan, and back.

** Panzer General, SSI ( 1994 ), video game ; strategic simulation game: Sea Lion ' 40 and Sea Lion Plus ( the latter with prestige points used to take over Gibraltar allowing Italian naval assistance ) scenarios are available given major victories in early operations, or the Sea Lion ' 43 after initial delays and later major victories in North Africa or Russia.

** WWII: German forces ( 2nd Panzer division ), under General Rudolf Veiel, reach Noyelles on the English Channel.

** 24th Oak Leaves on 17 July 1941 as Generaloberst and commander of Panzer Gruppe 2

** Third Panzer Army ( Colonel-General Georg-Hans Reinhardt )

** German 6th SS Panzer Army – Included the 1st SS Panzer Division Leibstandarte SS Adolf Hitler

** German 2nd Panzer Army

** 3rd Panzer Division-Commanded by General Leo Freiherr Geyr von Schweppenburg.

** Panzer Lehr Battalion.

** 4th Panzer Division-Commanded by General Georg-Hans Reinhardt.

** 10th Panzer Division

** 15th Panzer Division ( Gustav von Värst-wounded 29 May )

** XI SS Panzer Corps – SS-General Matthias Kleinheisterkamp

** 21st Panzer Division

** 10th SS Panzer Division " Frundsberg "

** XXXIX Panzer Corps – Lieutenant General Karl Arndt

** XXXXI Panzer Corps – Lieutenant General Rudolf Holste

** XXXXVIII Panzer Corps – General Maximilian von Edelsheim

** 1st Panzer Army ( Gotthard Heinrici )

** Elements of Hungarian First Army attached to the 1st Panzer Army

** First Panzer Army

** Fourth Panzer Army

** Fourth Panzer Army

** First Panzer Army