As part of Operation Enduring Freedom as a response to those attacks, the Netherlands deployed aircraft as part of the European Participating Air Force (EPAF) in support of ground operations in Afghanistan as well as Dutch naval frigates to police the waters of the Middle East/Indian Ocean. The Netherlands deployed further troops and helicopters to Afghanistan in 2006 as part of a new security operation in the south of the country. Dutch ground and air forces totalled almost 2,000 personnel during 2006, taking part in combat operations alongside British and Canadian forces as part of NATO's ISAF force in the south.