During December 2012, a total of four German Tiger UHTs were deployed to Afghanistan. The UHTs operated from Mazar-i-Sharif Air Base inside Afghanistan performing reconnaissance, ground support, and convoy protection duties. All Tigers deployed to the zone had previously undergone upgrades under the ASGARD programme; the modifications include the addition of new defensive systems, sand filters for the MTR390 engines, and enhancements to the communications suite. The German Army received the last of the ASGARD-upgraded Tigers in March 2014. In March 2013, Spain also deployed three Tiger HADs to the region to operate in support of Spanish ground forces. From 30 January 2013 to 30 June 2014, German Tigers in Afghanistan flew 1,860 hours over 260 missions supporting NATO ground troops, Afghan security forces, and humanitarian relief operations after floods. None of Germany's four deployed Tigers fired a shot in combat, which the Bundeswehr attributed to the helicopter's psychological impact through shows of force being sufficient to counter threats.