Find ANY rocket launcher with 'grenades and horseshoes' perk - best if it doesn't have tracking.
Grab heavy, anticipate which door the enemy lead members (with their delicious heavy full) will come through.
Wait till door cracks open in the slightest - fire rocket immediately jump behind cover (enemy rocket surely incoming) repeat, go collect enemy heavy drops.
60% of the time, works every time......
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I completely avoided rocket launcher until I got one with that perk, love it! You must be from San Diego... =p