This is a notice of the government's intent to issue a sole-source contract modification to Raytheon for support services related to the UAE PATRIOT Air Defense System. The services include advice, assistance, and training for planning, fielding, deployment, operation, maintenance, and sustainment. The underlying contract has a 10-year period of performance and a maximum ceiling value of $5 billion. The government states that Raytheon is the sole approved source capable of providing these services, as it does not own the necessary technical data. Unapproved sources may submit an alternate product package for a review process that can take over 180 days, but this will not be evaluated for the current procurement.