ISLAMABAD: President Arif Alvi on Wednesday wrote letters to the families of martyrs of Frontier Corps Balochistan (North and South) who embraced martyrdom while performing their duties, Radio Pakistan reported.The president in his letters lauded the services and sacrifices of the martyred personnel in the war against terrorismThe valour and courage demonstrated by martyred personnel for the country’s safety and security made every Pakistani, including me [Arif Alvi], proud, reads the letter.