When you have to blow up a tank and you dont have any rocket
launchers, take your C-4 and have it out  then have another team
member, or you, throw a smoke bomb right next to it then the person
with the C-4 runs to the tank and you have to get all the way against
it then crouch down and and face it put one piece of C-4 on it then
throw another smoke bomb and when it covers the tank or makes it so it
cant see then get on your feet and run back to your team members then
detonate the  C-4.