FEBA - Forward Edge of the Battle Area
Before the 'push' and to the amazement of most forces that where on the far side of the portal only a handful of minor (company or so) sized efforts had been made to retake the complex from the UAS marines. Their on going ELINT efforts over the few weeks of holding that position however had revealed why, the entire hold of the IFOR forces in the area had been tenuous even before all those divisions had poured through to another world and been smashed. The sudden reduction in occupation troops for what they guessed had been a country that had fallen to a similar operation and one of their main MSRs further in falling to the Marines seemed to have simply pushed their situation over the edge. A night hadn't gone by without flashes on the horizon and streams of troops and civilians moving around the complex, giving it a wide berth even as the Marines watched from UAVs and long range optics. However as the weeks ran into the first month they were withdrawn and replaced by Union Federal Army units, the first wave of engineers and garrison troops, the Marines themselves folded back into their regular units staging to push through the portal themselves.
The month long wait had been spent reorganizing what was left of Cascadium's OPSAD units, receiving Federal Army units, and figuring out were to fit the newly arrived Marine division into the mess. Civilians alive, dead, and missing had also been catalogued and thus the primary motivation for the invasion was discovered in the form of thousands of missing colonists. Their possible fates pulled from countless POWs, some willing and having been pressed into the misadventure… and others who'd been caught committing acts that soon found most on their way to the gallows if not beaten to death by angry OPSAD reservists who's family had died or worse under their care.
Much like the IFOR invasion it was a staged operation, that first relief unit having paved the way in a manner conducive to the mass continuous movement of troops and material from one realm to another. The first few days were simply a select group of units moving through and then out to expand their assigned section of the perimeter. Most of these initial units are recently landed Federal troops with assigned engineers and all waste no time in expanding the compact perimeter around the low mountain side.
With the conclusion of hostilities aside from mop up operations most original OPSAD units are liquidated and pooled into battalion sized units from various former commands. The crew of Dingo 1-2 and the team of Coyote 3-2 are no exceptions, folded into a dedicated armored cavalry team with Dingo 1-2 upgrading to a heavier tank after crash training to update years old familiarization.
Their new unit, a reinforced heavy battalion known as 103rd Heavy Combat Battalion, is assigned to take and hold a large shallow hill designated Hill 502, twenty kilometers south of Site Threshold. This begins a three day mechanized 'march' to the south as other battalions assigned similar positions off the points of the compass begin their own movements all toward establishing a new ring of bases around their entry point to Eideon.