2-54. The theater engineer command is designed to mission command engineer capabilities for all assigned or attached engineer brigades and other engineer units and missions for the joint force land component or theater Army commander. It is the only organization designed to do so without augmentation and can provide the joint force commander with an operational engineer headquarters or augment an engineer staff for a joint task force. The theater engineer command is focused on operational-level engineer support across all three of the engineer disciplines and typically serves as the senior engineer headquarters for a theater Army, land component headquarters, or potentially a joint task force. (See FM 3-34.)