text: Armies
  defense support of civil authorities. This option provides for a single 10 USC, functional component
  headquarters capable of providing general support to achieve unity of effort between federal and state
  response forces. (See JP 3-31 for additional responsibilities.)
  United States Army Pacific as a Theater Joint Force Land
  Component Commander
  In September 2013, to achieve unity of effort among joint forces in the land domain,
  the commander, USINDOPACOM, prepared an initiating directive for the designation
  of a theater JFLCC and deputy. This resulted in the February 2014 formal designation
  of the commander, United States Army Pacific, as the theater JFLCC; the commander
  of U.S. Marine Corps Forces, Pacific, as his deputy; and with support from the
  commander, Special Operations Command, Pacific as the Chief of Staff. While having
  only coordinating authority over the Marines and special operations forces, the theater
  JFLCC provided the United States Pacific Command commander not only with a
  means to synchronize land force activities during persistent military engagement and
  contingency operations, but also initially developed an accurate, timely, and persistent
  common operational picture of all land force activities occurring through the theater.
  To enhance effectiveness and create efficiencies in the land domain across the
  Services, the theater JFLCC advises the USINDOPACOM commander on the
  prioritization and allocation of land force capabilities; maintains a land domain common
  operational picture; coordinates land component planning; and tracks key leader
  engagements and land-based operations, actions, and activities. The theater JFLCC
  also had an established battle rhythm to enable coordination among the Commander,
  United States Army Pacific, Marine Forces Pacific, and Special Operations Command,
  Pacific. To operationalize the theater JFLCC, commander, United States Army Pacific
  also established the Theater Joint Land Force Component Command Coordination
  Center. With the change of USINDOPACOM and Service component leadership over
  time, the theater JFLCC role has evolved to the commander, United States Army
  Pacific remaining as the theater JFLCC but with reduced involvement of the other
  Service components with land activities as only supporting commands. The
  commander, United States Army Pacific, as the JFLCC, focuses on coordination for
  defense support of civil authorities as evidenced in support to Typhoon Yutu in Guam
  in November 2018, land based homeland defense planning and exercises, and
  continued synchronization of land component activities. The challenge of unity of effort
  remains with only coordination authority for day-to-day operations, but in crisis
  response and contingency planning, USINDOPACOM and its Service components
  value the synchronization that the theater JFLCC provides to maximize use of joint
  land capabilities. (See JP 3-31 for more information on theater JFLCCs, as it is the
  source of this vignette.)
  Joint Task Force
  3-47. The theater army may form the core element of a JTF headquarters. The theater army’s contingency
  command post is capable of forming the nucleus of a joint headquarters. When directed, a theater army uses
  its contingency command post as the nucleus of a JTF headquarters for a small-scale contingency operation
  of less than thirty days. An operation lasting longer than thirty days requires significant augmentation.
  3-48. The contingency command post offers the GCC an option for forming and deploying a JTF
  headquarters. The GCC uses the theater army’s contingency command post as the core element of a JTF
  headquarters and augments it with additional personnel, either Army or other Service, to accomplish the
  mission. Because of its established habitual internal staff working relationship, the theater army poses a viable
  option to support short notice and limited duration operations. (See JP 3-33 for more information on JTFs.)