Loewner serves in the US Marine Corps EXOFRAME Force Recon unit operating in Peru by 2023. Previously, in 2017, he worked as a security contractor for Cerberus Security Services, protecting a pier facility in the Persian Gulf. During this period, he maintained a cooperative and morally grounded demeanor, earning a "Nice Guy" reputation that prompted a directive from his commanding officer to moderate his behavior.

His role at Cerberus Security Services involved undercover intelligence gathering on Exoframe proliferation. He officially presented himself as a disgruntled former Marine transitioning into mercenary work, part of an active duty USMC operation classified as Institutional Allegiance Concealment. Within this role, he demonstrated a consistent ethical stance, particularly during a contractual dispute over unpaid obligations. While other CSS personnel advocated abandoning the pier and its civilian workers, Loewner expressed reluctance to withdraw protection, establishing him as the unit's Token Good Teammate.

By 2023, Loewner operated alongside Bowman and Rei Miyajima in EXOFRAME Force Recon. During this time, he engaged in analytical discussions on geopolitical shifts resulting from Exoframe technology, specifically analyzing Azanian President Reshep's policies. He theorized that Exoframe proliferation would equalize technological disparities between hemispheres, erasing traditional advantages held by developed nations. This perspective informed his professional assessments of global conflict patterns, particularly concerning coordinated Exoframe deployments Rei Miyajima encountered earlier in Pakistan.

During downtime aboard the USS Nimitz, Loewner smoked cigarettes and offered to share with Rei. This interaction led him to question Rei's motivations for combat, receiving the philosophical response that justice requires active pursuit rather than passive receipt.