Technically speaking old chaps, "Tac signs" are ONLY the Tactical signs occasionally placed on vehicles e.g Squadron symbol or temporary tactical markins (e.g. big number on back of a Sherman turret).
In addition to these the tac signs were:
1. WAR DEPARTMENT NUMBER (the original WD # is likely be stamped into the armour on a flat surface - likely starboard side. This was the case with WWII Lynx and UC e.g, F123456 or CF123456. I have original WWII Canadian issue stencils obtained from a WWII Cdn signpainter who served overseas and painted vehicles. If in Canada might have its WD number AND a DND number e.g. 55-123
2. BRIDGE SIGN
3. UNIT SIGN
4. FORMATION SIGN (I have original WWII decals, unused for the three Cdn tank/armoured brigades, all the Cdn divisions, the 2 Cdn corps, the First Cdn Army etc. )
5. CONVOY WHITE AREA AT REAR UNDERNEATH
6. VEHICLE NAME (optional in armoured units)
7. RAC red & white (early on)
8. AIR RECOGNITION MARKINGS (Roundel till 1943, then US white star)
9. GAS DETECTION PATCH
10. TIRE PRESSURES (NOT the US pattern "TP##"! OK, this was used but very RARELY. They used British style instead.)
Colin Stevens' web page on Cdn veh markings
