The Texas State Guard generally cannot be required to serve outside Texas, but there are exceptions for the governor’s actions and for fresh pursuit rules.
Sec. 437.306. USE OUTSIDE STATE; FRESH PURSUIT FROM OR INTO STATE. (a) Except as provided by Subsections (b) and (c), the Texas State Guard may not be required to serve outside the state. (b) The governor, on request of the governor of another state, may order all or part of the Texas State Guard to assist a military or civil authority of that state in defending that state. The governor may recall these forces. (c) If authorized by the law of another state, an organization, unit, or detachment of the Texas State Guard, on order of the officer in immediate command, may continue in fresh pursuit of an insurrectionist, a saboteur, an enemy, or enemy forces into that state until the apprehension or capture of the person or forces pursued or until military or police forces of that state or the United States have had a reasonable opportunity to apprehend, capture, or take up the pursuit of the person or forces. The Texas State Guard without unnecessary delay shall surrender a person apprehended or captured in another state to the military or police forces of that state or the United States. This surrender is not a waiver by this state of a right to extradite or prosecute the person for a crime committed in this state. (d) Military forces of another state may continue a fresh pursuit into this state in the same manner permitted the Texas State Guard under Subsection (c). The military forces of the other state shall without unnecessary delay surrender a person captured or arrested in this state to the military or police forces of this state to be dealt with according to law. This subsection does not prohibit an arrest in this state permitted by other law. Added by Acts 2013, 83rd Leg., R.S., Ch. 1217 (S.B. 1536), Sec. 1.01, eff. September 1, 2013.