The United States has sent 11 Yemeni detainees at the Guantánamo Bay detention center to Oman, the Pentagon said on Monday, in a major resettlement that nearly halves the detention facility’s remaining number of prisoners. The released men include Tawfiq al-Bihani, who had been cleared for transfer since 2010; Khalid Qassim, a long-term hunger striker who has spoken about spending most of his adult life in Guantánamo; and Hassan bin Attash, who was captured in a security raid in Pakistan in 2002. His older brother, Walid bin Attash, remains detained and is a defendant in a military tribunal, accused of