This opportunity involves modifications to existing indefinite-delivery/indefinite-quantity contracts for National Security Space Launch (NSSL) Phase 3 Lane 1. The modifications increase the total cumulative contract ceiling to $17,000,000,000. Performance locations include Centennial, Colorado; Merritt Island, Florida; Hawthorne, California; Renton, Washington; Long Beach, California; and Redondo Beach, California. No specific non-bid or submission timelines are mentioned. No specific budget amounts beyond the ceiling increase are provided.