Manslave2Eris made a post below with some good tips. I'll add a few different ones I used too. - When you get the first tank airdropped to you, ignore it. It's far too slow getting to the next area. Just use a Sparrow and go to the spawn point for the Interceptors there. When the two enemy tanks spawn, you have a choice to do some damage. You can either blast the first one with a rocket and then your super if it is available and then spawn an Interceptor, or just spawn an Interceptor right away. - With the Interceptor, ram the tanks. It's weird but ramming them can outright destroy them, or let you finish them off quickly with the Interceptor's gun. - Once the tanks are destroyed, head over to the tank spawn pad and now get a tank. Destroy any aircraft that are attacking if you want it to last, and the Cabal observer too if necessary. - Take out the guns and their shields. If you have followed what I mentioned, you'll probably have a good 45 extra seconds at least to do this, and probably three minutes overall. It's longer than you think. Don't panic and take your shots carefully. - Once all the generators are done, the 5-minute timer actually stops. It seems like a lot of people don't realize this. You'll still have to blast down the door into the next part of the challenge with the tank, but if you don't die you have time to do it. - In the next part, I found that using a glaive with suppression and an Unstoppable mod was great. - In the final section, quickly take out any turrets that spawn. I got up onto the platform they spawn on before they do and used my glaive on them as soon as they come in. That worked great. - Also use rockets on the Boss and then get close with the glaive and just stab him like crazy. The suppression slows him right down. Anyways, in the end, you might use a different weapon or strategy but whatever you do you need something that will do heavy damage quickly. You don't have time to whittle enemies down. Shotguns, fusion rifles, and glaives are all good when going after the final boss, but remember you're going to have to deal with Unstoppable Champions, so plan accordingly. That's why I ended up using a glaive. Good luck.