[Footnote 4-18: Memo, Dir, Pers, for Dir, Div of Plans and Policies, 21 Jul 48, sub: GCT Percentile Equivalents for Colored Enlisted Marines in November 1945 and in March 1948, sub file: Negro Marines--Test and Testing, Ref Br, Hist Div, HQMC.] If these figures are used as a base, slightly more than 70 percent of all black enlisted men, more than 11,000, scored in the two lowest categories, a meaningless racial statistic in terms of actual numbers because the smaller percentage of the much larger group of white draftees in these categories gave the corps more whites than blacks in groups IV and V. Yet the statistic was important because low-scoring Negroes, unlike the low-scoring whites who could be scattered throughout the corps' units, had to be concentrated in a small number of segregated units to the detriment of those units. Conversely, the corps had thousands of Negroes with the mental aptitude to serve in regular combat units and a small but significant number capable of becoming officers. Yet these men were denied the opportunity to serve in combat or as officers because the segregation policy dictated that Negroes could not be assigned to a regular combat unit unless all the billets in that unit as well as all replacements were black--a practical impossibility during World War II. Segregation, not the draft, forced the Marine Corps to devise new jobs and units to absorb the black inductees. A plan circulated in the Division of Plans and Policies called for more defense battalions, a branch for messmen, and the assignment of large black units to local bases to serve as chauffeurs, messengers, clerks, and janitors. Referring to the janitor assignment, one division official admitted that "I don't think we can get away with this type duty."[4-19] In the end the Negroes were not used as chauffeurs, messengers, clerks, and janitors. Instead the corps placed a "maximum practical number" in defense battalions. The number of these units, however, was limited, as Maj. Gen. Harry Schmidt, the acting commandant, explained in March 1943, by the number of black noncommissioned officers available. Black noncommissioned officers were necessary, he continued, because in the Army's experience "in nearly all cases to intermingle colored and white enlisted personnel in the same organization" led to "trouble and disorder."[4-20] Demonstrating his own and the Marine Corps' lack of experience with black troops, the acting commandant went on to provide his commanders with some rather dubious advice based on what he perceived as the Army's experience: black units should be commanded by men "who thoroughly knew their [Negroes'] individual and racial (p. 105) characteristics and temperaments," and Negroes should be assigned to work they preferred.