Final answer:
During the Great Depression, veterans of the Bonus Army built the recreation huts on military bases as temporary shelters in their protest for early payment of military bonuses.
Step-by-step explanation:
During the Great Depression, the recreation huts on military bases were primarily built by the veterans who were part of the Bonus Army. The Bonus Army was a group of World War I veterans who marched on Washington, DC, in 1932 to advocate for early payment of military bonuses. They set up a Hooverville, which was a shantytown named after President Herbert Hoover, and camped on the lawn outside the Capitol Building. The military, under the orders of President Hoover, later dispersed the protesters and burned down the shantytown.
The recreation huts provided a temporary shelter for the veterans and served as a place where they could gather and find some comfort. However, these huts were not permanent structures and were built out of basic materials like wood, straw, and rock. They were a reflection of the difficult living conditions that many veterans faced during the Great Depression.