THE BURNED OVER DISTRICT

Having worn out their welcome in the Middle East, the great mercenary princes are looking for new opportunities to array their armies and grow their profits. Some of the companies are looking to Mexico as a new revenue source.

After years of lucrative work in the Middle East and Central Asia, where their presence has been occasionally marred by incidents of excessive force and misconduct, contractors and private security firms of varying sizes and specialties are being drawn into a battle closer to home. But Mexico’s restrictive gun laws mean that foreign contractors must enter the bloody drug war unarmed as they take jobs ranging from consulting and technical training for the Mexican military to guarding business executives from kidnapping gangs and extortionists.

Virginia-based DynCorp International has job openings in Mexico for aviation instructors and mechanics. The Manhattan consulting firm Kroll hires anti-kidnapping specialists to protect Mexican business executives. MPRI, a company based in Alexandria, is training Mexican soldiers in counterinsurgency techniques.

The companies are beckoned by swelling pots of public and private contracting gold. In November, the Pentagon’s counter-narco-terrorism program office solicited bids on more than $3 billion in contracts worldwide, with an unspecified amount destined for operations in Mexico. The State Department has pledged nearly $2 billion in drug war aid to Mexico since 2008, much of it available to U.S. companies that can provide equipment or services to the embattled Mexican government.

Security spending by private companies in Mexico and the Mexican government has also surged. Since President Felipe Calderon deployed Mexico’s military against the country’s drug kingpins in December 2006, the number of armed private security firms in the country has doubled, Mexican federal police statistics show. But while there are 1,400 licensed firms in good standing, analysts say there may be another 10,000 operating without proper authorization.

There is one real roadblock to any large presence in Mexico. Foreigners are not allowed to carry firearms in Mexico. Add in Mexico's long standing antipathy toward armed gringos in their country and you have an effective check on their activities.