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The first wave of National Guard troops has taken up observation posts along the Texas-Mexico border.

Several dozen soldiers deployed in the Rio Grande Valley are part of the up to 1,000 troops called up by Gov. Rick Perry last month, Texas National Guard Master Sgt. Ken Walker of the Joint Counterdrug Task Force said Thursday.

Several guardsmen were seen Thursday afternoon manning an observation tower along the busy road leading to the Hidalgo International Bridge.