The major limitation constraining any design was the Washington Naval Treaty of 1920. After "Lexington" and "Saratoga", there were remaining for construction of aircraft carriers. This resulted in modeling for three 23,000 long ton carriers, four 17,250 ton carriers, and five 13,800 ton carriers. Of the three sizes, the smaller 13,800 was selected because the five hulls would have the largest aggregate aircraft capacity. Wargames had indicated that severe attrition to airframes and hulls would occur in any war. The college's solution was to maximize the number of aircraft and hulls allowable under the treaty.