Image for correct rank

I have this script, I need to make it so an imagelabel or whatever comes up Above the players head that coresponds to their militaty rank, I dont know how. this is what i have

NOT ALL OF IT JUST THE MAIN PART roblox is down and this is all i have saved


    Create'BillboardGui'{
        Name = 'Nametag';
        Parent = Custom;
        Size = UDim2.new(5, 0, 0.5, 0);
        StudsOffset = Vector3.new(0, 2, 0);
        Create'TextLabel'{
            Name = 'NameLabel';
            BackgroundTransparency = 1;
            Size = UDim2.new(1, 0, 1, 0);
            Position = UDim2.new(0, 0, -0.8, 0);
            Font = 'Antique';
            Text = Character.Name;
            TextColor3 = Color3.new(1, 1, 1);
            TextScaled = true;
            TextStrokeTransparency = 0.5;
        };
        Create'TextLabel'{
            Name = 'RankLabel';
            BackgroundTransparency = 1;
            Size = UDim2.new(1, 0, 0.92, 0);
            Position = UDim2.new(0, 0, 0.2, 0);
            TextTransparency = .1;
            Font = 'Antique';
            FontSize = Enum.FontSize.Size12;
            Text = Player:GetRoleInGroup(7157060);
            TextColor3 = Color3.new(1, 1, 1);
            TextScaled = true;
            TextStrokeTransparency = 0.5;
        };
    }