HMCS "Bonaventure" was sold off in 1970, shortly after completing a 16-month, $11 million mid-life refit. The 1970s saw the addition of four s, which were later updated to air defence destroyers, and in the late 1980s and 1990s the construction of twelve s and the purchase of the s. In 1990, Canada deployed three warships to support Operation Friction. Later in the decade, ships were deployed to patrol the Adriatic Sea during the Yugoslav Wars and the Kosovo War. More recently, Maritime Command provided vessels to serve as a part of Operation Apollo and to combat piracy off the coast of Somalia.