UNSC strike craft, and vehicles are given shields from Mass Effect Organizations from both Halo/Mass Effect also give their tech to everyone. Spartan's are given additional augments that Shepard can obtain. Weapon's can be exchanged out to give the best possible odds for the given soldier
![imperial guard drop troops imperial guard drop troops](https://pbs.twimg.com/media/D1oTtb_WoAAcoHY.jpg)
All UNSC Marines/ODST that do not under go Spartan training are instead given access to System Alliance Augments. The Lazarus Project brings back fallen heroes from both sides that died in their respective wars (assuming their bodies are recovered even if totally erased, Legion VI now A.I is instead a back up version of Legion fully fledged out) Halo faction are given Omni Tools (assume Omni Tools can create Halo ammo/Special forces will get custom melee omni tool options) Smart weapons are installed in all UNSC/Cov Weapons if not already installed All UNSC, and Cov forces that do not have shielding will get shielding N7 Operatives/Biotics undergoing Spartan IV training (This includes Shepard, Jacob, Kaiden, Jack etc) In this time both tech is shared amongst one another giving them the best chance they got However both Halo and Mass Effect have 5 years to prepare for the invasion that will take place at the newly combined Earth of UNSC/System Alliance.
![imperial guard drop troops imperial guard drop troops](https://cdnb.artstation.com/p/assets/images/images/016/592/453/4k/mike-shomaker-screenshot0377.jpg)
The universes of both Halo and Mass Effect decided it is within their best interest to work together as one against the Imperium of Man that has judged them to conspire with Xeno's, use heretical technology, and a million other violations.