Iowa Code Title I. State Sovereignty and Management [Chs. 1-38D] § 29A.8. State active duty

a. In case of insurrection or invasion, or imminent danger of insurrection or invasion.

b. For the purpose of assisting the civil authorities of any political subdivision of the state in maintaining law and order in the subdivision in cases of breaches of the peace or imminent danger of breaches of the peace, if the law enforcement officers of the subdivision are unable to maintain law and order, and the civil authorities of the subdivision request the assistance.

c. For the purposes of providing support to civil authorities during emergencies resulting from disasters or public disorders and for performing homeland defense or homeland security duties.

d. For training, recruiting, escort duty, and duty at schools of instruction, as a student or instructor, including at the Iowa military academy.

e. To participate in parades and ceremonies of a civic nature.

f. For other purposes as the governor may deem necessary.