Tanker boots have a significant disadvantage over traditional lace up combat boots in that they provide comparatively little ankle support; however for troops that fight sitting in an armoured vehicle, this is relatively unimportant. * An unauthorized variant of the tanker boot is the cavalry boot, or 'cav boot', which is higher above the ankle (in imitation of riding boots worn by the old horse cavalry) and might be worn by soldiers assigned to armored cavalry squadrons and scout units. The cav boots are more commonly seen being worn by officers in armored cavalry units.