SAN DIEGO The chair of the House Armed Services Committee asked the Pentagon today to remove CNN reporters embedded with US combat units. The network televised portions of a video on Wednesday showing insurgent snipers targeting U-S military personnel. Executives said the tape came to the network unexpectedly through contact with an insurgent leader.Representative Duncan Hunter wrote in his letter that, quote, "CNN has now served as the publicist for an enemy propaganda film featuring the killing of an American soldier." San Diego-area Republicans Darrell Issa and Brian Bilbray also signed the letter. CNN executives defended their decision to air the footage, saying its news value outweighed other concerns.