Executive Chair, Jack Detzel

As Executive Chair of Roll Call Chicagoland, Jack provides strategic leadership and governance oversight, guiding the organization’s mission to connect, support, and empower military-connected individuals and their families throughout the Chicagoland area.

Jack recently retired after a distinguished 38-year career with PepsiCo, where he held multiple leadership positions across manufacturing, warehousing, transportation, supply and demand planning, customer service, and supply chain optimization. He helped lead major initiatives including the implementation of VMI planning and SAP ERP systems across PepsiCo’s diverse subsidiaries such as Quaker Oats, Gatorade, Tropicana, Frito-Lay, and the Pepsi Bottling Company.

A proud veteran advocate, Jack served for five years as Chair of PepsiCo’s military and veterans Employee Resource Group, Valor. Under his leadership, Valor strengthened PepsiCo’s reputation as a national leader in veteran hiring and partnered with numerous organizations including USO Illinois, Fisher House Foundation, American Corporate Partners, Fort2Base, Operation Shower, and Roll Call Chicagoland.

Jack holds a Bachelor of Science degree in Transportation Logistics and Operations Management from The Ohio State University, with minors in Mathematics, Computer Science, and Economics. An avid runner and community volunteer, he has completed multiple marathons and enjoys coaching youth sports, playing guitar, and reading history.

"Supporting the military-connected community isn’t just a mission—it’s a calling. I’m proud to continue this work with the team at Roll Call Chicagoland."

Vice Chair of Operations, Justin Miller

As Vice Chair of Operations for Roll Call Chicagoland, Justin oversees event coordination, membership engagement, marketing, and communications efforts that directly support RCC’s mission of empowering veterans and their families through community, networking, and career development. He has been a vital member of RCC since 2017 and stepped into his current leadership role in 2020.

Justin is a U.S. Army veteran with more than a decade of active and reserve service, including two deployments to Iraq. After separating from the military in 2013, he dedicated his civilian career to advocating for and supporting the veteran community across the Chicagoland area. His professional journey has included leadership roles with the USO, Rush University Medical Center’s Road Home Program, Dog Tag, and Student Veterans of America Illinois, where he served as Executive Director.

In addition to his RCC role, Justin currently serves as Director of Workforce Development Programs at Chicago Veterans, where he helps military-connected job seekers access mentorship, resources, and corporate partnerships. He is also the founder of Candor & Consideration, a consultancy focused on community-building and veteran advocacy.

Justin holds a Master of Business Administration from Keller Graduate School of Management and a Bachelor of Science in Marketing from DeVry University.

"Helping veterans and military families discover purpose and community after service is both my passion and my profession."

When he’s not working or volunteering, Justin enjoys taking on home DIY projects, spending time with his three children, and living by the mottos: “Try everything twice” and “Don’t sweat the small stuff.”

Vice Chair of Development, Sirena Arnaout

As Vice Chair of Development for Roll Call Chicagoland, Sirena plays a critical role in expanding partnerships, driving volunteer engagement, and advancing RCC’s mission to support veterans and military families through networking, mentorship, and career readiness programs. A member of Roll Call since its inception 11 years ago, she joined the leadership team eight years ago and has served in multiple capacities, including events and community engagement.

Sirena is a seasoned human resources leader with over 11 years of experience in talent acquisition, workforce development, and employee resource group leadership. Currently, she serves as a Business Execution Lead at Zurich North America, where she has also chaired Zurich’s veterans employee resource group and played a pivotal role in the company’s apprenticeship and workforce development efforts. Prior to Zurich, she held HR and recruiting positions with Sears Holdings and Kmart.

Known for her dedication to empowering transitioning veterans, Sirena specializes in career coaching, interview preparation, networking strategies, and community outreach. She volunteers approximately 300 hours a year supporting charities and veteran programs across the Chicagoland area.

Sirena holds a degree in Business Administration and Management from Macomb Community College. Outside of her professional and volunteer work, she enjoys boating and proudly purchased her first boat in 2022—a milestone she looks forward to enjoying every season.

Strategy Chair, Martin Fernandez

As Strategy Chair for Roll Call Chicagoland, Martin helps guide organizational priorities and long-term planning to ensure RCC remains responsive and impactful for veterans and military families across Chicagoland. A dedicated leader and mentor, he brings decades of military, technical, and business expertise to support RCC’s mission of community, networking, and career development.

Martin is a retired U.S. Army Staff Sergeant with 4 years of active duty, including service in the White House Communications Agency providing secure communications for President Ronald Reagan, Vice President George H.W. Bush, and senior cabinet officials. He continued his service with 22 years in the Illinois Army National Guard, including deployment to Iraq (2004–2005) as a Battalion Signal Officer supporting the Big Red One Infantry Division and the 101st Airborne Division.

Following his military career, Martin transitioned into the private sector where he has built a 30+ year career in telecommunications, product development, and large-scale project management. He currently serves as a Senior Project Manager with Dematic, where he oversees multi-million-dollar warehouse integration projects for global clients. His previous civilian roles include leadership positions at USRobotics, 3Com, UL Solutions, and enVista.

At RCC, Martin spearheaded the development of the organization’s mentorship program, personally guiding veteran job-seekers and training fellow volunteers to become more effective mentors.

Martin holds a Bachelor of Arts in Interdisciplinary Studies from Northeastern Illinois University and is a Certified Scrum Master, Lean Six Sigma Green Belt and Lean Leader, and Supply Chain Professional.

Outside of work and volunteering, Martin lives in Morton Grove, Illinois, with his wife. They are proud parents of five grown children. He enjoys music, motorcycles, fishing, golf, and staying engaged in politics.