as you can see from my stats, i dont have expert explosives, because i didnt have the required global kills, however i do have vet explosives, and i got mine jihad jeeping in kark. I thought that it would be really hard getting the badge, since i hear all this talk of OmFg HELp meH wih t thhe badgew!!1! but i wanted vet explosives, too add to my goal of all vet badges. Amazingly, i got my basic and vet explosives in the same round. my advice for jihad jeeping is not to go for tanks apc's, and other armored vehicles. my advice is to go for people. its basic human nature to want to have a sense of belonging, so people, even in games, usually travel in groups. bingo. instead of the measly 1, or if you are lucky, 2 kills from a tank, you could get 2, 3, even 6 (yes i did get six with one jeep) kills when going for infantry. If you want to go for infantry, then you need to think about the C4 placement. the targets arent always going to be directly infront of you, so the most effective way is to stick 3 on the front fender, then the remaining 2 on the sides of the car. this increases the blast radius to kill the people who tried to run out of the way.
And that children, is how i got my vet explosives