Operation Tight Screw is the codename given for a secretive joint military operation which the Pakistan military had claimed they were going to launch to tackle militants in the North Waziristan that is part of the Pakistan's counter terrorism effort in the North-West of the country.
Background
At combatant JS HQ, the military operation has long being planned in the North Waziristan agency but was delayed due to limited resources. Terrorists chiefly belonging to TTP group moved to hideouts in North Waziristan agency after military operations were conducted in Kurram, Orakzai and South Waziristan regions adjacent to North Waziristan.
References
Operation Tight Screw Wikipedia(Text) CC BY-SA