RAWALPINDI: Chairman Joint Chiefs of Staff Committee (CJCSC) General Sahir Shamshad Mirza and Bangladesh’s air and navy chiefs have vowed to improve defence and security collaboration, the Inter-Services Public Relations (ISPR) said on Monday. Ever since a popular uprising in Bangladesh toppled Sheikh Hasina’s government in August last year, there has been a thaw in ties between Islamabad and Dhaka, …