Col ® Tassawar served Pakistan Army for 25 years during which he attended advance and staff courses in Security & Intelligence, besides other Military and Corporate professional courses. Before retirement from the Military in 2017, he was assigned as Wing Commander of Punjab Rangers deployed at Federal Capital Islamabad responsible for security of Red Zone, Ministers Enclave, HQ OGDCL and PTCL. Later he was assigned the responsibility of monitoring the Security situation as senior staff officer in South Waziristan from where he was appointed as the head of security for National Logistic Cell (NLC) where he served for three years.
After retirement, in July 2018 he took on the present assignment of heading the security department of APEX Consulting Pakistan for coordinating Security of Polio Monitoring Teams and gaining access to restricted and difficult areas all over Pakistan.