| Starting this Fall, two surveillance blimps will be tested 10,000 feet over the Army’s Aberdeen Proving Ground in Maryland. The Pentagon says it's an attempt to develop a defense for the nation’s capital, but critics say it’s an invasion of privacy

Starting this Fall, two surveillance blimps will be tested 10,000 feet over the Army’s Aberdeen Proving Ground in Maryland. The Pentagon says it's an attempt to develop a defense for the nation’s capital, but critics say it’s an invasion of privacy. David Martin reports. Air Date: Jan 23, 2014