The 4th Electromagnetic Warfare Squadron (4EWS) has a new requirement for two twenty-foot ISO Shelters to be delivered to Peterson Space Force Base (SFB) and deployed to other locations. See attachmen... The 4th Electromagnetic Warfare Squadron (4EWS) has a new requirement for two twenty-foot ISO Shelters to be delivered to Peterson Space Force Base (SFB) and deployed to other locations. See attachments for all solicitation information.