Complete Laura Lockhart's entire story arc Collateral Damage twice (Ouroboros entry 22.01, level range 20-24.) The second run needs to be via Flashback in order to fulfill these additional objectives:

• In the mission Infiltrate the 5th Column Base, use the crate containing the Handwritten Note clue.
• Before starting the mission Stop the Fighting in Steel Canyon, speak to Mender Valen in Ouroboros and accept the Ouroboros Teleporter.
• Within this mission, successfully protect the Dupont Towers building by completing the objective Protect Dupont Towers! within the time limit.
• In the mission Defend the UNSF Base, when speaking to Laura Lockhart use the Ouroboros Teleporter.
• Before starting the mission Track down Leon, visit Mender Valen in Ouroboros again.
• Within this mission, speak to Mender Laura.