Best mode if you are doing this alone is Big Team Battle “BTB” Capture the Flag “CTF. You need to find a Razorback, which is a grey vehicle that looks like the Warthog, but it has no gun on it.
Next drive it to your base and wait there until 3 people get in the Razorback. Honk the horn at them to get their attention by pulling the shoot trigger.
If you have friends set up an Xbox Live party or if on PC do so with Steam or anything similar and repeat the steps above.