4-14. The theater army and its supporting commands assess the adequacy of infrastructure in an operational area to support anticipated military operations, determine requirements for additional infrastructure, and manage infrastructure development programs assigned to Army forces for execution. The theater army and the TSC develops these plans in close collaboration with the combatant command’s logistics directorate of a joint staff (J-4) and the Army Corps of Engineers. Infrastructure development activities may include identifying requirements for forward basing and air, land, and sea transit rights through the sovereign territories of partner or neutral nations. However, the Department of State and the appropriate U.S. diplomatic mission must negotiate any bilateral or multilateral agreements.