How do i equip the motion mine on battlefield bad company 2?

Im fairly new to battlefield bad company 2 (online game time of 7hrs or so) and i've unlocked the motion mines but for some reason it doesn't appear when i select my kit... How do you equip motion mines? I have definitely unlocked them as it says so in the weapons and gadgets menu :C|||you play as the recon class and press right on your d-pad to equip motion mines