U.S. policy on terrorism has evolved through years of experience in combatting terrorism. The U.S. policy is based upon the conviction that to give in to terrorists’ demands places even more Americans at risk. This no-concessions policy is considered as the best way of ensuring the safety of the greatest number of people.
Bowe Robert Bergdahl, the only US soldier held prisoner in Afghanistan has been freed on May 31, 2014, as part of a swap deal brokered by the government of Qatar that included the release of five Afghan prisoners held in Guantanamo Bay, Cuba.
It is not clear if the current prisoners exchange reflecting a new U.S policy or an exception as a response to unique situation.