Zack serves in the American special forces unit SWORD alongside Vexille Serra and Leon Fayden, operating within a paramilitary structure dedicated to investigating banned technological developments. He maintains a friendly and relaxed demeanor that contrasts sharply with SWORD’s high-stakes operations. During the mission to infiltrate Japan, Zack participates in the unit deployed to uncover the truth behind Japan's decade-long isolation and Daiwa Heavy Industries' activities. The team encounters fierce resistance upon entering Japan, resulting in the capture of multiple members. Zack engages in active combat roles and contributes to intelligence-gathering objectives focused on Japan's concealed technological advancements.