Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Washington (CNN) The US government said Thursday that it had approved a $2 billion arms sale to the United Arab Emirates. The State Department approved the sale of 60 Patriot Advanced Capability 3 missiles and 100 Patriot Guidance Enhanced-Tactical (GEM-T) missiles to the UAE, according to a statement released by the Defense Security Cooperation Agency, which oversees America's foreign arms sales. The UAE has fielded and operated Patriot missile batteries, which are capable of shooting down enemy missiles and aircraft, since 2009 and is one of several major US allies to use the system. Congress was informed of the sale Wednesday, the announcement said, noting that the package will also include US government- and contractor-provided technical, engineering and logistics support services.The package will include US technical, engineering and logistics supportThe UAE and US enjoy close military-to-military links 
 Question:The statement added that the sale "will enhance interoperability with _ forces and increase security" while adding that "these missiles will not alter the basic military balance in the region."

US