33 U.S. Code § 569c - Services of volunteers
The United States Army Chief of Engineers may accept the services of volunteers and provide for their incidental expenses, including expenses relating to uniforms, transportation, lodging, and the subsistence of those volunteers, to carry out any activity of the Army Corps of Engineers except policy-making or law or regulatory enforcement. Such volunteers shall not be employees of the United States Government except for the purposes of (1) chapter 171 of title 28, relating to tort claims, and (2) chapter 81 of title 5, relating to compensation for work injuries.
2014—Pub. L. 113–121, which directed amendment in the first sentence of chapter IV of title I of Public Law 98–63 (33 U.S.C. 569c) by inserting “, including expenses relating to uniforms, transportation, lodging, and the subsistence of those volunteers,” after “incidental expenses”, was executed by making the insertion in the first sentence of this section to reflect the probable intent of Congress.