-When you lay the Mk. V mines with the No73 "Thermos" kit (you can find it in Alam Halfa, Fall of Tobruk and Sidi Rezegh, maybe more), the red skull doesn't appear.
-Also, is it normal that the Hawkins AT mine disappears too early being alive? At least that is what happens in Luttich.
They should last like the rest of AT mines, right? (as long as you are alive they won't disappear)