US Ambassador to Pakistan David Hale appreciated the ongoing Operation Radd-ul-Fasaad to purge the country of terrorism, a statement issued by the Inter-Services Public Relations (ISPR) said.The envoy called on Chief of Army Staff (COAS) General Qamar Javed Bajwa on Tuesday and discussed matters of regional security and mutual interest.According to the military's media wing, the visiting dignitary acknowledged and appreciated Pak Army's contributions towards regional peace and stability.The military offensive Operation Radd-ul-Fasaad was launched after a series of attacks in the country in February.Gen Qamar said last month that the operation is aimed at utilising the success of military operations to bring lasting peace, stability and normalcy to the country.