A group of gay and lesbian veterans will launch a national campaign tomorrow at Harvard to repeal the military’s policy of “don’t ask, don’t tell.” The seven-week, nationwide speaking tour, which will begin at 7 p.m. at the John F. Kennedy School of Government’s Starr Auditorium, will feature seven former service members who argue that the law keeps able-bodied Americans from serving in the military at a time when it is desperate to recruit and retain troops because of the war in Iraq. “A lot of people have never known a gay or lesbian person and, as a result, have...