Pubdate: Wed, 19 Jul 2000 Date: 07/19/2000 Source: New York Times (NY) Author: Miguel Vivanco "Colombians Tell of Massacre, as Army Stood By" (front page, July 14) was a chilling description of a daily reality for Colombians -- massacres carried out by paramilitaries operating with the tolerance or open support of soldiers. Colombia's military continues not only to shield the senior officers involved but also to reward them with promotions. The $1.3 billion aid package for Colombia signed by President Clinton includes conditions requiring respect for human rights. But if Mr. Clinton invokes the "national security" waiver in the military part of the package, it would gut any commitment to human rights. Tragically, we would see more massacres like El Salado. In the future, however, the United States risks being complicit. MIGUEL VIVANCO, Exec. Dir., Americas Division, Human Rights Watch Washington, July 17, 2000