Press Release

HOUSTON – July 11, 2022 – KBR (NYSE: KBR) was awarded a strategic contract to expand its health and human performance research and development (R&D) support of the 711th Human Performance Wing, a unit of the Air Force Research Laboratory (AFRL).

Under this 3-year $20 million contract, KBR will provide scientific support focused on airman readiness medical research. The cost-plus-fixed-fee contract leverages KBR’s existing R&D efforts at AFRL onto a new agreement with an increased scope of work.

Under the terms of the award, KBR will provide scientific and medical expertise to AFRL at Wright-Patterson Air Force Base. KBR human health and performance specialists will investigate airmen readiness to include the biomedical impacts of air and space as well as cognitive and physiological performance. KBR will support aerospace physiology research in Wright-Patterson’s new centrifuge and research altitude chambers facilities in Ohio, as well as Neurology, Operational Vision and Enroute Care studies.

“With professional services ranging from biomedical to health science, human research and laboratory management, the Air Force regularly works with KBR to pioneer advances in human performance and medicine,” said Byron Bright, President of KBR Government Solutions U.S. “As a part of KBR’s Zero Harm culture, the well-being of our service members is always top priority. Our team is excited to participate in this critical research to advance the military’s understanding of the capabilities of the human body.”

KBR has supported medical research and testing with a focus on human health and performance for more than 40 years. For the past 10 years, KBR at Brooks Air Force Base in San Antonio, Texas, has been the lead test and evaluation provider for aircraft and personal high-altitude oxygen and protection systems within the industry and for the Department of Defense and NASA.

About KBR

We deliver science, technology and engineering solutions to governments and companies around the world. KBR employs approximately 28,000 people performing diverse, complex and mission-critical roles in 34 countries.

KBR is proud to work with its customers across the globe to provide technology, value-added services, and long- term operations and maintenance services to ensure consistent delivery with predictable results. At KBR, We Deliver. Visit www.kbr.com.

Forward Looking Statement

The statements in this press release that are not historical statements, including statements regarding future financial performance, are forward-looking statements within the meaning of the federal securities laws. These statements are subject to numerous risks and uncertainties, many of which are beyond the company's control that could cause actual results to differ materially from the results expressed or implied by the statements. These risks and uncertainties include, but are not limited to: the significant adverse impacts on economic and market conditions of the COVID-19 pandemic and the company's ability to respond to the resulting challenges and business disruption; the recent dislocation of the global energy market;; the company's ability to manage its liquidity; the outcome of and the publicity surrounding audits and investigations by domestic and foreign government agencies and legislative bodies; potential adverse proceedings by such agencies and potential adverse results and consequences from such proceedings; changes in capital spending by the company's customers; the company's ability to obtain contracts from existing and new customers and perform under those contracts; structural changes in the industries in which the company operates; escalating costs associated with and the performance of fixed-fee projects and the company's ability to control its cost under its contracts; claims negotiations and contract disputes with the company's customers; changes in the demand for or price of oil and/or natural gas; protection of intellectual property rights; compliance with environmental laws; changes in government regulations and regulatory requirements; compliance with laws related to income taxes; unsettled political conditions, war and the effects of terrorism; foreign operations and foreign exchange rates and controls; the development and installation of financial systems; the possibility of cyber and malware attacks; increased

competition for employees; the ability to successfully complete and integrate acquisitions; and operations of joint ventures, including joint ventures that are not controlled by the company.

KBR's most recently filed Annual Report on Form 10-K, any subsequent Form 10-Qs and 8-Ks, and other U.S. Securities and Exchange Commission filings discuss some of the important risk factors that KBR has identified that may affect the business, results of operations and financial condition. Except as required by law, KBR undertakes no obligation to revise or update publicly any forward-looking statements for any reason.

For further information, please contact:

Investors

Alison Vasquez

Vice President, Investor Relations

713-753-5082

Investors@kbr.com

Media

Philip Ivy

Vice President, Global Communications and Marketing

713-753-3800

MediaRelations@kbr.com