Thompson, a career military intelligence officer who first entered the administration as Vice President Mike Pence's national security adviser, admonished Pakistan in the letter for having "relocated, maintained and operated" the American made F-16s and the AMRAAM missiles they use from forward operating bases not approved under the original terms of the sale. The former Army colonel, who left the White House in
September, also expressed concern at the access Pakistani officials allowed American weapons inspectors
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"While we understand from you that these aircraft movements were done in support of national defense objectives," Thompson wrote in the letter, "the U.S. government considers the relocation of aircraft to non-U.S. government authorized bases concerning and inconsistent with the F-16 Letter of Offer and Acceptance."
"Such actions could subject sensitive U.S.-technologies to diversion to or access by third parties, and could undermine our shared security platforms and infrastructures," Thompson wrote.
A flare-up in military tensions between Pakistan and India began in mid-February, after a Pakistani militant group claimed credit for a suicide bombing in Kashmir that killed 40 Indian security personnel. India has consistently claimed that Pakistan uses militants to destabilize the region, which Pakistan and India have each claimed since they were separated by partition in 1947.
The subsequent tensions escalated as both countries deployed fighter jets, and in one dogfight an Indian plane was shot down. Its pilot landed in Pakistani territory and was imprisoned until his release in March. On Feb. 28, the Indian government
presented evidence it says showed Pakistani jets fired AMRAAM missiles at the Indian planes.
The Pakistani armed forces possess 76 American-supplied F-16s – by far the most potent fighter jet in its military arsenal. Pakistan first began receiving the plane in 1982 and maintains them under strict rules imposed by the State Department, the Department of Defense and Congress. Among the rules are that Islamabad may only house the fighters and the corresponding American missiles on two specific air force bases at Mushaf and Shahbaz and that it only uses them for counter-terror operations, not against foreign countries.
The agreement for their sale and subsequent operation, governed in part by the State Department's Defense Security Cooperation Agency, also stipulates that American contractors and mechanics must have access to the jets at any time of day or night both to help maintain them and to monitor how the Pakistani military employs them.
The agency in July – weeks before Thompson's letter – re-approved the terms for these monitors, known as Technical Security Teams, at a cost of $125 million.
"This proposed sale will support the foreign policy and national security of the United States by protecting U.S. technology through the continued presence of U.S. personnel that provide 24/7 end-use monitoring," the agency wrote in
a statement announcing the renewed contract, which must receive congressional approval.
Those who track aerial combat in the region and the weapons used for it aren't surprised that Pakistan would risk being caught violating its agreement with the U.S. when it regards an issue as hotly contested as Kashmir.
"Given how volatile the situation was, it was important for both sides not to lose face in getting their plane shot down," says Karl Kaltenthaler, a professor at the University of Akron. "It makes sense that Pakistan would do that, but it was at the potential cost of getting called out by the U.S. for using the weapons platform that way. For the Pakistanis, this is how they operate."
In her letter, Thompson raised concerns about American access to the bases and the U.S.-made equipment there. She said it had been four years since Office of Defense Representative–Pakistan – the office that carries out defense cooperation with partner countries – had been allowed to perform an assessment of the security vulnerabilities on the Pakistani bases.