Tex. Civ. Prac. & Rem. Code 79.004
Liability: Disaster Training Exercise
An individual who participates in training exercises that prepare the individual to provide care, assistance, or advice during a disaster will not be held legally responsible for acting or failing to act. They can be held legally responsible if acting with extreme carelessness or intent to cause harm.
Liability for Training Exercises
Except in a case of reckless conduct or intentional, wilful, or wanton misconduct, a person who is immune from civil liability for an act or omission that occurs in giving care, assistance, or advice with respect to the management of an incident to which this chapter applies is immune from civil liability for an act or omission that occurs during the execution of a training exercise intended to prepare the person to give that care, assistance, or advice.