I’m a little confused regarding the order you’re supposed to buy REQ Packs. Is it Bronze, Silver, and Gold? Or do you skip Bronze entirely? Because I was under the impression that the latter was the case, but I have reason to assume I may have messed something up by following it.
If your objective is to unlock all the weapon, vehicle, armor mode certifications and all of the customizations as fast as you can, purchase Silver packs first then Gold packs. Skip the Bronze packs. You will know when you are finished with each level because you will start receiving REQ points back instead of Permanent Unlocks. With Silvers, you will receive two cards, each having a value of 1,500 REQ points, whereas, with Golds, you will receive two cards, each having a value of 3,000 REQ points. The regular Mongoose vehicles are received only in Bronze packs. There are no REQ points given back in Bronze packs after unlocking the Mongoose certifications.
Adding to the above, it is best to skip Bronze packs until the end because there are no guaranteed unlocks with Bronze packs. If you buy them initially, you will end up wasting points on a chance to unlock an item that would otherwise be guaranteed in a Silver pack, for example.