A popular contrast between shall and will appeared in the 19th Century, in the 20th century, and continues to the present ::

:: 20th Fighter Group, RAF Kings Cliffe

:: 7th Pz, 20th Pz, 14th Mot. Div., 20th Mot. Div.

:: 20th Pz, SS " Das Reich " Mot. Div., 3rd Mot. Div.

In 2006, Blue Peter reunited for a concert to commemorate the release of The Best of Ready :: 20th Century Masters — The Millennium Collection.

* The Best of Ready Volume 1 :: 20th Century Masters — The Millennium Collection ( released 2006 ), Ready Records compilation

* The Best of Ready Volume 2 :: 20th Century Masters — The Millennium Collection ( released 2006 ), Ready Records compilation

:: 20th 2006, 21st 2006, 23rd 2011, 24th 2006, 24th 2006, 26th 2011

:: School of Paris early 20th century, France

:: in the 20th year

:: 24th Brigade Support Battalion

:: 2nd Light Horse Brigade ( Brigadier General G. de L. Ryrie )

:: New Zealand Mounted Rifle Brigade ( Brigadier General W. Meldrum )

:: 18th Brigade RHA ( Inverness, Ayrshire and Somerset Batteries ) and Divisional Ammunition Column

:: 10th Cavalry Brigade ( Brigadier General W. G. K. Green / Howard-Vyse )

:: 11th Cavalry Brigade ( Brigadier General C. L. Gregory )

:: 12th Cavalry Brigade ( Brigadier General J. T. Wigan )

:: 13th Cavalry Brigade ( Brigadier General P. J. V. Kelly )

:: 14th Cavalry Brigade ( Brigadier General G. V. Clarke )

:: 15th ( Imperial Service ) Cavalry Brigade ( Brigadier General C. R. Harbord )

:: 3rd Light Horse Brigade ( Brigadier General L. C. Wilson )

:: 4th Light Horse Brigade ( Brigadier General W. Grant )

:: 5th Light Horse Brigade ( Brigadier General C. Macarthur Onslow ) ( attached XXI Corps till 22 September )

:: 19th Brigade RHA.

:: 1st Light Horse Brigade ( Brigadier General C. F. Cox )

:: 2nd Light Horse Brigade ( Brigadier General G. de L. Ryrie )

:: New Zealand Mounted Rifle Brigade ( Brigadier General W. Meldrum )

:: 18th Brigade RHA ( Inverness, Ayrshire and Somerset Batteries ) and Divisional Ammunition Column

:: 155th ( South Scottish ) Brigade

:: 156th ( Scottish Rifles ) Brigade

:: 157th ( Highland Light Infantry ) Brigade

:: 161st ( Essex ) Brigade

:: 162nd ( East Midland ) Brigade

:: 163rd ( Norfolk & Suffolk ) Brigade

The Montoneros ' leadership was keen to learn from the ERP's Compañía de Monte Ramón Rosa Jiménez operating in the Andean province of Tucumán and in 1975 sent " observers " to spend a few months with the ERP platoons operating against the 5th Infantry Brigade, then consisting of the 19th, 20th and 29th Mountain Infantry Regiments.

Garfield later commanded the 20th Brigade of Ohio under Buell at the Battle of Shiloh, where he led troops in an attempt, delayed by weather, to reinforce Maj Gen. Ulysses S. Grant, after a surprise attack by Confederate General Albert S. Johnston.

The My Lai Massacre (, ;,, or ) was the Vietnam War mass murder of between 347 and 504 unarmed civilians in South Vietnam on March 16, 1968, by United States Army soldiers of " Charlie " Company of 1st Battalion, 20th Infantry Regiment, 11th Brigade of the Americal Division.

Following his commission, Calley was assigned to Company C, 1st Battalion, 20th Infantry Regiment, 11th Infantry Brigade, and began training at Schofield Barracks, Hawaii, in preparation for deployment to Vietnam.

Edmonton also has a large army reserve element from 41 Canadian Brigade Group ( 41 CBG ), including The Loyal Edmonton Regiment ( 4th Battalion, Princess Patricia's Canadian Light Infantry ); 41 Combat Engineer Regiment ; HQ Battery, 20th Field Artillery Regiment ; and B Squadron of The South Alberta Light Horse, one of Alberta's oldest army reserve units.

The regiment left the state October 14, 1862 ; it served in the defenses of Washington in the 3rd Brigade, Abercrombie's Division, from October 16, 1862 ; in 3d, Hughston's, Brigade, Gurney's Division, Department of Virginia, at Suffolk, Virginia, from April, 1863 ; in the 1st Brigade, Gordon's Division, of 7th Corps, from May, 1863 ; of 4th Corps, from June, 1863 ; in the 1st Brigade, 3rd Division, 11th Corps, from July 14, 1863 ; in the 3d Brigade, 1st Division, 20th Corps, from April, 1864 ; in the 2d Brigade, Bartlett's Division, 22d Corps, from June 30, 1865 ; and, under Col. Horace Boughton, it was honorably discharged and mustered out July 20, 1865, at and near Washington, D. C.

Major-General the Earl of Cavan ’ s 6th Brigade ( 1 / 20th, 2 / 20th and 63rd Foot ).

SSG Christopher B. Waiters of the 5th Battalion, 20th Infantry Regiment, 3d Brigade Combat Team, 2nd Infantry Division.

On the day after the Mukden Incident on 19 September, he ordered the IJA 20th Division to split its force, forming the 39th Mixed Brigade.

Despite heavy losses, in the Winter War the Red Army's 20th Tank Brigade, equipped with T-28s, fulfilled its mission to break the defensive Mannerheim Line.

In 1940 he became second-in-command of 20th Armoured Brigade.

He was assigned to the 2nd Brigade, which consisted of the 34th, 53rd, 62nd, and 20th Regiments of Foot.

A further rotation of ground troops occurred in November 2003, with 19 Light Brigade relieved by 20th Armoured Brigade ; 20th Armoured Brigade in its turn being relieved by 1 Mechanised Brigade.