This is a solicitation for 2,500 units of a flight-critical item that requires pre-existing government source approval. Only previously approved sources have been solicited directly, as the timeline for approving a new source is typically too long to delay an award. Unapproved sources may still submit a proposal but must include a complete source approval information package concurrently. The delivery terms are FOB Origin. Award decisions may proceed based on Fleet support needs if a new source's approval cannot be processed in time.