Answer:
It set up an infantry training camp at Camp Gruber, is the right answer.
Explanation:
Laurence H. Rooney founded the Manhattan Construction Company in the year 1896 in the Oklahoma Territory. The main contribution of this company to Oklahoma's efforts during World War II can be seen in terms of the establishment of an infantry training camp at Camp Gruber. Throughout the Second World War, Camp Gruber provided training to army, field cannons, and tank warship troops that went on to fight in Europe.
