An tArm (Army)

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An tArm is the Ground Component of The Irish Defence Forces with 8,000 personnel of which 6,000 are on active duty while the remaining 2,000 are held in reserve on a rotational basis.

1st Brigade (Cork)

- 1st Infantry Battalion (Galway)
- 3rd Infantry Battalion (Kilkenny)
- 5th Infantry Battalion (Limerick)
- 7th Artillery Regiment (Cork)
- 9th Calvary Squadron (Boyle)
- 11th Engineer Battalion (Portlaoise)

2nd Brigade (Dublin)

- 13th Infantry Battalion (Dublin)
- 15th Infantry Battalion (Carlow)
- 17th Infantry Battalion (Kells)
- 19th Artillery Regiment (Longford)
- 21st Calvary Squadron (Athlone)
- 23rd Engineer Battalion (Wicklow)

3rd Brigade (Sligo)

- 25th Infantry Battalion (Sligo)
- 27th Engineer Battalion (Donegal)
- 29th Calvary Squadron (Dundalk)
- 31st Parachute Battalion (Monaghan)
- 33rd Recon Battalion (Ardee)

4th Brigade (Mullingar)

- 35th Calvary Squadron (Mullingar)
- 37th Recon Battalion (Castlebar)
- 39th Engineer Battalion (Letterkenny)
- 41st Recon Battalion (Carrickmacross)