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The Infanteria de Marina de Chile (or Chilean Marine Corps, nicknamed the "Cossacks") is the naval infantry arm of the Armada de Chile. The Cossacks are charged with making amphibious assaults, ensuring security aboard ships and in naval bases, and operating the various coast defense installations.

The main infantry arm of the IMC is composed of six battalion-sized detatchments, or Destacamento de Infantería, which form the Chilean Marine Brigade:

- DIM No. 1 "Lynch"
- DIM No. 2 "Pisagua"
- DIM No. 3 "Aldea"
- DIM No. 4 "Cochrane"
- DIM No. 5 "Miller"
- DIM No. 6 "Aguila"

Four additional company-sized units of Marines are stationed aboard the attack transports Parinacota, Copahue, Tronador, and Lascar. These units are called Special Amphibious Assault Companies (Compañía Especial de Asalto Anfibio), but are more regularly referred to as the Marine Cossacks.
- CEAA No. 1 (Parinacota)
- CEAA No. 2 (Copahue)
- CEAA No. 3 (Tronador)
- CEAA No. 4 (Lascar)

The IMC is also responsible for manning the coastal batteries, and have seven major Coastal Artillery Brigades (Brigada de Artillería Costera).
- BAC No. 1 Valparaiso
- BAC No. 2 Talcahuano
- BAC No. 3 Arica
- BAC No. 4 Iquique
- BAC No. 5 Puerto Montt
- BAC No. 6 Valdivia
- BAC No. 7 Antofagasta

The Chilean Marines are also present on many Chilean Navy ships, where they are employed as naval gunners, ship security teams, and naval boarding teams. Many larger ships* have a platoon or more of Marines who are qualified as naval boarding teams. Finally, the IMC is responsible for the security of naval bases, the Navy commander-in-chief, state shipyards, radio transmitters, and other locations as required by the Navy. These tasks are carried out by units formed as necessary for the job.

Major Facilities
- Fort O'Higgins: located on the Tumbes Peninsula nort of Talcahuano. Houses CENBIM, the Marine training facilities.
- Fort Aguayo: located in the city of Concon, north of Valparaiso and Vina del Mar. Houses the Center for Logistics Support.
- Fort Condell: located south of Iquique.
- Fort Gaona: located in Río de los Ciervos, south of Punta Arenas.

* Those ships being Almirante Latorre, Almirante Cochrane, Valparaiso, Santiago, Almirante Gideon, O'Higgins, Capitan Oyama, Volcan Osorno Constitución, Maunga Terevaka, Mapuche, Chiloe, Atacama, Picunches, Antofagasta, Astraea, Tierra del Fuego, Concepción, Chillán, Guardia Marina Hyatt, and Piloto Pardo. An additional Marine Honor Guard is stationed aboard the museum ship/monitor Huascar.

This formation was revised in 1939-1940 and is no longer used by active units.

Marine Infantry Squad:
- 1 Corporal: SMG
- 8 privates: 1 LMG, 1 SMG, 6 rifles
- Total: 9 men, 2 SMGs, 1 LMG, 6 rifles

Marine Infantry Platoon:
- 4 rifle squads: 9 men each
- 1 command squad: 1 lieutenant (SMG), 1 sergeant (carbine), 2 runners (2 carbines)
- Total: 40 men, 4 LMGs, 9 SMGs

Marine Infantry Company:
- 1 company commander: pistol
- 4 rifle platoons: 40 men
- 1 mortar squad: 3x50mm mortars, 12 men
- 1 command squad: 4 messengers (4 carbines), flamethrower section (4 men, 2 flamethrowers, 2 rifles), anti-fortications squad (10 men, 4 AT rifles/satchel charges). 18 men total.
- Total: 191 men

Marine Infantry Battalion:
- 4 infantry companies: 191 men each
- 1 machinegun platoon: 12xHMGs, 66 men
- 1 Cazadores platoon: 40 men
- 1 mortar platoon: 57 men and 4x81mm mortars
- 1 battalion HQ: 6 men
- 1 battalion commander
- Total: 934 men, 16 mortars, 12 HMGs

See HERE for discussion

Marine Rifle Team:
- 1 team leader (Private 1st Class/Cabo Segundo): 1x M31 SMG or FM36 rifle
- 2 riflemen (Soldado): 1x FM36 rifle
- Total: 3 men, 1 SMG + 2 rifles or 3 rifles

Marine LMG Team:
- 1 team leader/light machine gunner (Private 1st Class/Cabo Segundo): 1x FN Browning BAR
- 1 MG assistant (Soldado): 1x M31 SMG or Mauser 1895 Carbine
- 1 rifle grenadier: 1x FM36 rifle with rifle grenades
- Total: 3 men, 1 LMG + 2 rifles, carbines, or SMGs

Marine Infantry Squad:
- 1 NCO (Corporal/Cabo Primero): 1x SMG
- 1 LMG team: 3 men, 1 LMG + 2 rifles
- 2 rifle teams: 3 men, 3 rifles
- Total: 10 men, 1 LMG, 3-4 SMGs

Marine Infantry Platoon:
- 3 infantry squads: 10 men each
- 1 command squad: 1 lieutenant (SMG), 1 sergeant (carbine), 2 runners (2 carbines)
- Total: 34 men, 3 LMGs, 10-12 SMGs

Marine Support Platoon:
- 1 mortar squad: 12 men, 2x50mm mortars
- 1 command squad: 4 messengers, 4 carbines or SMGs
- 1 flamethrower section: 4 men, 2 flamethrowers, 2 rifles
- 1 anti-fortications squad: 6 men, 3 AT rifles or satchel charges
- 1 company MMG team: 4 men, 1 MMG, 3 carbines or SMGs
- Total: 30 men, 2 mortars, 1 MMG, 2 flamethrowers, 3 AT rifles

Marine Infantry Company:
- 1 company commander: SMG or carbine
- 1 company XO: SMG or carbine
- 1 company NCO: SMG or carbine
- 3 rifle platoons: 34 men
- 1 support platoon: 30 men, 2 mortars, 3 AT rifles, 2 flamethrowers
- Total: 135 men, 2 mortars, 3 AT rifles, 2 flamethrowers

Destacamento de Infantería (DIM):
- 3 infantry companies: 135 men, 2 mortars, 3 AT rifles, 2 flamethrowers
- 1 machinegun platoon: 6xHMGs or MMGs, 35 men
- 1 Cazadores platoon: 34 men
- 1 mortar platoon: 57 men and 4x81mm mortars
- 1 battalion HQ: 6 men
- 1 battalion commander
- Total: 538 men, 6 HMGs, 4x81mm mortars + 6x50mm mortars, 6 AT rifles, 6 flamethrowers

See HERE for discussion

Marine Rifle Team:
- 1 team leader (Private 1st Class/Cabo Segundo): 1x M31 SMG or FM36 rifle
- 2 riflemen (Soldado): 1x FM36 rifle
- Total: 3 men, 1 SMG + 2 rifles or 3 rifles

Marine LMG Team:
- 1 team leader/light machine gunner (Private 1st Class/Cabo Segundo): 1x FN Browning BAR
- 1 MG assistant (Soldado): 1x M31 SMG or Mauser 1895 Carbine
- 1 rifle grenadier: 1x FM36 rifle with rifle grenades
- Total: 3 men, 1 LMG + 2 rifles, carbines, or SMGs

Marine Infantry Squad:
- 1 NCO (Corporal/Cabo Primero): 1x SMG
- 1 LMG team: 3 men, 1 LMG + 2 rifles
- 2 rifle teams: 3 men, 3 rifles
- Total: 10 men, 1 LMG, 3-4 SMGs

Marine Infantry Platoon:
- 3 infantry squads: 10 men each
- 1 command squad: 1 lieutenant (SMG), 1 sergeant (carbine), 2 runners (2 carbines)
- Total: 34 men, 4 LMGs, 9 SMGs

Marine Support Platoon:
- 1 mortar squad: 12 men, 2x50mm mortars
- 1 command squad: 4 messengers, 4 carbines or SMGs
- 1 flamethrower section: 4 men, 2 flamethrowers, 2 rifles
- 1 anti-fortications squad: 6 men, 3 AT rifles or satchel charges
- 1 company MMG team: 4 men, 1 MMG, 3 carbines or SMGs
- Total: 30 men, 2 mortars, 1 MMG, 2 flamethrowers, 3 AT rifles

Marine Infantry Company:
- 1 company commander: SMG or carbine
- 1 company XO: SMG or carbine
- 1 company NCO: SMG or carbine
- 3 rifle platoons: 34 men
- 1 support platoon: 30 men, 2 mortars, 3 AT rifles, 2 flamethrowers
- Total: 135 men, 2 mortars, 3 AT rifles, 2 flamethrowers

Marine Amphibious Carrier Platoon:
- 14 Tortuga amphibious carriers: 3 crewmen (driver, gunner, assistant MG)
- Total: 42 men, 14 amphibious carriers

Marine Amphibious Vehicle Company:
- 3 amphibious carrier platoons: 42 men, 14 amphibious carriers
- 1 amphibious gun carrier squadron: 16 men, 4 Tortuga amtanks (4 crew each)
- 16 3.5t Terrestre 8x8 trucks (non-amphibious)
- Total: 142 men, 42 amphibious carriers, 4 amtanks, 16 medium trucks

Mechanized Destacamento de Infantería (DIM):
- 3 infantry companies: 135 men, 2 mortars, 3 AT rifles, 2 flamethrowers
- 1 amphibious vehicle company: 142 men, 42 amphibious carriers, 4 amtanks, 16 medium trucks
- 1 machinegun platoon: 6xHMGs or MMGs, 35 men
- 1 Cazadores platoon: 34 men
- 1 mortar platoon: 57 men and 4x81mm mortars
- 1 battalion HQ: 6 men
- 1 battalion commander
- Total: 680 men, 42 amphibious carriers, 4 amtanks, 16 medium trucks, 6 HMGs, 4x81mm mortars + 6x50mm mortars, 6 AT rifles, 6 flamethrowers

See HERE for discussion

Marine Rifle Team:
- 1 team leader (Private 1st Class/Cabo Segundo): 1x M31 SMG or FM36 rifle
- 2 riflemen (Soldado): 1x FM36 rifle
- Total: 3 men, 1 SMG + 2 rifles or 3 rifles

Marine LMG Team:
- 1 team leader/light machine gunner (Private 1st Class/Cabo Segundo): 1x FN Browning BAR
- 1 MG assistant (Soldado): 1x M31 SMG or Mauser 1895 Carbine
- 1 rifle grenadier: 1x FM36 rifle with rifle grenades
- Total: 3 men, 1 LMG + 2 rifles, carbines, or SMGs

Marine Infantry Squad:
- 1 NCO (Corporal/Cabo Primero): 1x SMG
- 1 LMG team: 3 men, 1 LMG + 2 rifles
- 2 rifle teams: 3 men, 3 rifles
- Total: 10 men, 1 LMG, 3-4 SMGs

Marine Infantry Platoon:
- 3 infantry squads: 10 men each
- 1 command squad: 1 lieutenant (SMG), 1 sergeant (carbine), 2 runners (2 carbines)
- Total: 34 men, 3 LMGs, 10-12 SMGs

Marine Support Platoon:
- 1 mortar squad: 12 men, 2x50mm mortars
- 1 command squad: 4 messengers, 4 carbines or SMGs
- 1 flamethrower section: 4 men, 2 flamethrowers, 2 rifles
- 1 anti-fortications squad: 6 men, 3 AT rifles or satchel charges
- 1 company MMG team: 4 men, 1 MMG, 3 carbines or SMGs
- Total: 30 men, 2 mortars, 1 MMG, 2 flamethrowers, 3 AT rifles

Compañía Especial de Asalto Anfibio:
- 1 company commander: SMG or carbine
- 1 company XO: SMG or carbine
- 1 company NCO: SMG or carbine
- 3 rifle platoons: 34 men
- 1 support platoon: 30 men, 2 mortars, 3 AT rifles, 2 flamethrowers
- Total: 135 men, 2 mortars, 3 AT rifles, 2 flamethrowers