-----------------------------------
Texas Rangers

CSI article cited in post # 7 above.

http://bibdaily.com/pdfs/Army%20on%2...der%20OP22.pdf

has some Texas Ranger history in chap. 2 (mid-1800's) and chap 4 (Villa era) - which led to some problems in those eras. Nothing on Texas Rangers in that article after the Villa era.

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For a general overview of international police cooperation, see list of Mathieu Deflem's publications at

http://www.cas.sc.edu/socy/faculty/d....html#articles

and more specifically, as to US, Canada and Mexico:

International Police Cooperation in Northern America:
A Review of Practices, Strategies, and Goals in the United States, Mexico, and Canada
http://www.cas.sc.edu/socy/faculty/deflem/zAMINPO.htm

The Boundaries of International Cooperation:
Problems and Prospects of U.S.-Mexican Policing
http://www.cas.sc.edu/socy/faculty/deflem/zintcor.htm

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Hummer

Report: Border Patrol confirms 29 incursions by Mexican officials into U.S. in 2006
By Olga R. Rodriguez
ASSOCIATED PRESS

3:33 p.m. January 9, 2008

MEXICO CITY – The U.S. Border Patrol confirmed 29 recorded incursions into the U.S. by Mexican military or other government agents in the last 12 months, according to a report made public Wednesday by a watchdog group.

Judicial Watch, a conservative, U.S.-based public interest group, said in a news release that Mexican officials were armed in 17 of the 29 incursions during the fiscal year between October 2005 to October 2006.
......
U.S. officials also have been accused of incursions into Mexico. In November 2006, U.S. Border Patrol agents chasing suspected drug traffickers on the Texas border allegedly crossed into Mexico and had a brief standoff with Mexican police officers.
http://www.signonsandiego.com/news/m...ncursions.html

Mexican incursions inflame border situation
House panel told of shootings by gunmen in Mexican military uniforms
By Brock N. Meeks
Chief Washington correspondent
MSNBC
updated 9:33 p.m. ET, Tues., Feb. 7, 2006
......
An incident last month in Hudspeth County, Texas, along the border east of El Paso
.....
On Jan. 23, a group of Texas deputy sheriffs, acting on a tip, intercepted a group of drug smugglers
.....
When confronted by the deputies, the drug smugglers raced back across the border while men in Mexican military uniforms, driving a Humvee, “took up a defensive position” that Hudspeth County Sheriff Arvin West described as a "military maneuver."
.....
Nothing unusual

Mexican soldiers caught inside U.S. boundaries “isn’t a new phenomenon,” said David Aguilar, chief of the U.S. Border Patrol. Although the Mexican military has an “internal policy” that states they won’t operate within about two miles of the U.S., that policy is routinely violated or simply ignored, he said. “We often spot them” near or inside U.S. borders, Aguilar said.

And on several occasions the U.S. has chased, apprehended and even detained members of the Mexican military, Aguilar said during his testimony. However, the U.S. has no concrete evidence that the Mexican military is in any way involved in drug smuggling, Aguilar was quick to point out.
http://www.msnbc.msn.com/id/11226144

Looks like the Hummer is more likely to be heading north to protect the Toyota heading south to the RG.

(photo caption from above url)
Unidentified men unload bundles of drugs from a SUV that became stuck in the Rio Grande at Neely's Crossing, east of El Paso. Men in Mexican military uniforms and armed with automatic weapons provided cover for the group, according to Hudspeth County Sheriff deputies that confronted the group.