This is a small-business set-aside RFQ for firm-fixed-price servicing and preventative maintenance of air compressors, air dryers, and air purification systems, structured as a base year plus three option years. Performance will occur at the 185th Air Refueling Wing, 2920 Headquarters Avenue, Sioux City, IA 51111-1300, with the contractor providing all personnel, equipment, tools, materials, supervision, and quality control per the Performance Work Statement and equipment listing. Award is intended to the lowest-priced quote that meets or exceeds the minimum specifications, with a single award anticipated though multiple awards may be made if in the Government’s best interest. The applicable NAICS code is 333912 with a 1,000-employee size standard, and offerors must submit required vendor information, adequate product/technical documentation, and representations/certifications unless already completed in SAM. Contractors must have active SAM registration and use WAWF/iRAPT for electronic invoicing and EFT payment; site visits or equipment photos may be requested through the Contracting Officer.