The 34th Infantry Brigade (map designate: INF 34 X) was an infantry formation of the UNSC Army during the Human-Covenant war. This brigade was garrisoned in the Viery territory of the Human colony of Reach. It participated during the invasion to counter Covenant Army landing forces, primarily in the western theater.
At the time of the assault on Viery by the Covenant invasion forces, the 34th Infantry had four regiments and two separate battalions.
- 4th Regiment — (INF 34 ||| 4) Central Viery
- 14th Regiment — (INF 34 ||| 14) Northern Viery
- 581st Regiment — (INF 34 ||| 581) Western Viery
- 594th Regiment — (INF 34 ||| 594) Western Viery
- 556th Battalion — (INF 34 || 556) Eastern Viery
- 1337th Battalion — (INF 34 || 1337) Eastern Viery