The National Aeronautics and Space Administration's Goddard Space Flight Center is pleased to release the Request for Proposal (RFP) for the Sounder for Microwave-Based Applications acquisition. This ... The National Aeronautics and Space Administration's Goddard Space Flight Center is pleased to release the Request for Proposal (RFP) for the Sounder for Microwave-Based Applications acquisition. This RFP replaces Draft RFP 80GSFC25R7005 issued on April 18, 2025 (including all amendments), in its entirety. All attachments to this posting together constitute the complete RFP, including all instructions, restrictions, provisions, and contract clauses.