You really haven't given enough details here, like how many men are in my squad and what are their levels of experience, how far exactly is it to the LZ, what equipment does the enemy have, how good a head start we have on them etc etc (SALUTE report next time soldier). But assuming this is forested or jungle terrain then easy. Also assuming these are just footsoldiers and not an equally well trained unit and that there are no dogs. Set up the four claymores along the main road the vehicles are using for pursuit, I'd space them so they interesct fire in pairs probably about 50-100 meters apart depending on what kinda time we're looking at. Next divide the squad into 2-3 teams depending on our numbers and equipment and take off in line formations probably at about 100M spreads so we can rally easier. When the front vehicle moves into the second kill zone is when you're gonna set off all four and pop a decent amount of smoke. Hopefully the terrain is bad enough that they can't get their light wheels back into formation fast enough but if they have alot then staying off the road was your best bet anyway. Move quickly, but not recklessly and set up a grenade to trip every 100M or so, saving at least one for any possible engagements. This will slow down any on foot pursuit cause they will naturally not keep running headlong into explosives if they are; one, indeed on your trail, and two, afraid to die. Considering we are indeed a special ops unit and this is an "official" operation we should be in constant contact with the bird who can give us some fire support if necessary and should be able to locate a closer LZ if we're really in the shit.