Nearly a half-century after African-Americans were admitted to Texas A&M University, a black student has finally reached the pinnacle of one of its signature organizations. Marquis Alexander has been selected to become commander next school year of the famed Corps of Cadets. The high-profile post that involves establishing the cadets' dress codes for their military-style uniforms and setting their daily schedule, including physical training that can begin before dawn. Texas A&M is about 100 miles northwest of Houston where Alexander grew up. Despite recruiting efforts by the school, Houston's inner-city areas typically don't produce future Aggies. Black students represent less than 4 percent of the 40,000 undergraduate students at the College Station campus. The Cadets' racial breakdown largely reflects the school's, but Alexander says: "We're working on that."