Earth and Mars offer Drummer a library of tactical scenarios centered on defending Sol, while their combined fleets increasingly require union command and strength.
The Earth-Mars Coalition floods People's Home with diplomats, coordinators, and military planning after Medina falls. Its liaison Benedito Lafflin presents scenario after scenario for intercepting the Heart of the Tempest, mining or masking the gate, and positioning the fleets. Every plan returns to protecting Earth and Mars regardless of the cost elsewhere.
The coalition navy no longer automatically dominates humanity's defense: the Transport Union's void cities and ships are at least comparable in strength. Board debate and divided command threaten every joint plan, leaving Camina Drummer to conclude that effective resistance likely requires her to direct both forces. The coalition may also hold undisclosed firmware exploits capable of helping Saba penetrate Laconian communications on occupied Medina.
The coalition appears as Earth and Martian fleets spread across orbital positions and vectors, military attachés, tactical simulations, and delegations crowding a Belter void city.
The coalition is the inner-planet military partner whose survival plans, intelligence tools, and forces must be integrated with Drummer's wider resistance.