Amendment 01: Answers to the questions received in response to the RFI have been posted via document labeled "Fuel Cell RFI Answers"The U.S. Army Project Manager Integrated Visual Augmentation System (PM IVAS) is conducting a Sources Sought market survey to identify sources with the interest and capability to provide a fuel cell with replaceable or refillable cartridges capable of providing energy to maintain the charge of a Conformal Wearable Battery or directly power Nett Warrior (NW)/IVAS equipment suite. Any fuel cell technology and fuel source that can be safely handled by the user is acceptable. Additional details can be located in the attachment labeled Fuel Cell RFI.29 OCT 2021: Referenced White Paper attachment added to