copy pasting some shit from the wookipedia for my own reference
command structure, numbers and ranks
Command structure of regular forces
Grand Army—10 systems armies (3,000,000 troopers) led by Supreme Chancellor Palpatine.[18] The number 3,000,000 was Sifo-Dyas' initial order, as the number of total clones increased during the war.
Systems Army—2 Sector Armies (294,912 troopers) led by a High Jedi General (Jedi High Council Member).
Sector Army—4 corps (147,456 troopers) led by a Senior Jedi General (Jedi Master).
Corps/Division—4 legions (36,864 troopers) led by a Marshal Commander and a Jedi General (Jedi Knight or Master).
Legion/Brigade—4 regiments (9,216 troopers) led by a Senior Commander and a Jedi General (Jedi Knight).
Regiment—4 battalions (2,304 troopers) led by a Regimental Commander and a Jedi Commander (Jedi Padawan).
Battalion—4 companies (576 troopers) led by a Battalion Commander and a Major.
Company—4 platoons (144 troopers) led by a Captain and a Lieutenant.
Platoon—4 squads (36 troopers) led by a Second Lieutenant and Sergeant-Major.
Squad—9 troopers led by a Sergeant and Corporal.
Command structure of special forces
Special Operations Brigade (SO BDE)—20 groups (10,000 troopers), commanded by Jedi General Arligan Zey, made up of 10 Commando Groups by one year after the Battle of Geonosis.
Commando Group—5 companies (500 troopers), the equivalent of a regular army battalion.
Company—5 troops (100 troopers) led by a commander.
Troop—5 squads (20 troopers).
Squad—4 troopers led by a sergeant.
Jedi ranks
High Jedi General—Jedi High Councilors in command of one of the ten Systems Armies.
Senior Jedi General—Jedi Masters in command of one of the twenty Sector Armies.
Jedi General—Jedi Knights in command of corps or legions.
Jedi Commander—Jedi Padawans in command of regiments and battalions.
Non-clone ranks
Brigadier General—A rank desired by Meebur Gascon. They either commanded brigades or performed headquarters assignments and staff functions, including heading non-combat departments.
Colonel—This rank was held by Meebur Gascon, a hero of the Battle of Geonosis.
Clone ranks
Marshal Commander—The highest rank a clone soldier could attain. Like all commanders, their armor was color-coded yellow. The rank indicator HUD glyph was eight dots, arranged in two parallel horizontal lines of four. Each marshal commander was in command of a corps.
Senior Commander—The second highest rank attainable by the clone forces. Their armor was color-coded yellow and the rank indicator HUD glyph was two horizontal rows of three dots running parallel. Each was in command of a brigade or legion.
Regimental Commander—Also indicated by yellow armor. HUD glyph was arranged in two parallel rows of two dots. Each was in command of a regiment.
Battalion Commander—the lowest commander rank of the clone forces. Also indicated by yellow armor, HUD glyph was that of two dots, stacked vertically. Each was in command of a battalion.
Major—Their armor was color-coded red. HUD glyph was four vertical lines running parallel. Each was second in command of a battalion.
Captain—Captain's armor was also color-coded red, with an HUD glyph of three vertical parallel lines. Each was in command of a company.
Lieutenant—Indicated by blue armor. Rank was indicated by an HUD glyph of two vertical parallel lines. Each was in command of a platoon.
2nd Lieutenant—Indicated by blue armor. Rank was indicated by an HUD glyph of one vertical line. Each was in command of a platoon.
Sergeant Major—Indicated by green armor. They were second-in-command of platoons and had an HUD glyph of four chevrons.
Sergeant—Also indicated by green armor, was in command of a squad and had an HUD glyph of three chevrons.
Corporal—The second lowest rank of clone forces. They were second-in-command of squads and had an HUD glyph of two chevrons.
Trooper—The lowest rank in the clone forces and had an HUD glyph of one chevron.
Cadet—This rank was even lower than trooper. It was used by new clones. These ones had not passed their final trial and therefore could not yet be considered soldiers.