The Tariq-class destroyers are ex-Royal Navy Type 21 frigates acquired by the Pakistan Navy from the United Kingdom in 1993-94. Although the Royal Navy classified these ships as frigates, they are classed as destroyers by the Pakistan Navy. They were bought in order to replace the Garcia class and Brooke class frigates which, due to the Pressler Amendment, Pakistan had to return to the United States at the end of their five-year lease. The Pakistanis have tested a Camcopter S-100 helicopter Unmanned aerial vehicles from a Type 21 helideck.