Scottish-based regiments are among those poised to be in the front line of the war in Iraq. Challenger tanks of the Royal Scots Dragoon Guards will help to spearhead the move into Iraq, backed by the 1st Battalion, the Black Watch. Both are part of the 7th Armoured Brigade, better known as the Desert Rats. Among the tasks of the Dragoon Guards is reconnaissance, sniffing out Saddam Hussein's initial lines of defence. Sergeant Frank Mack, from Leith, is leading a section into Southern Iraq to collate information vital to commanders as they decide how and where to deploy Challenger 2...