Several unofficial trading spots were set up around the Summit on cots or blankets. Lackland AFB completely exhausted the Air Force's supply of steel folding cots and mattresses. China shipped 3,000 tents along with more than 500 camp cots. Their farmhouse was arranged for multiple cots or sleeping bags. He had a spartan upbringing that included sleeping on army cots and taking cold baths. The hotel furniture was replaced by Army cots and collapsible tables. These included both large brothels and one-room "cellae meretriciae", or "prostitute's cots". NASA and SpaceX signed a contract for COTS cargo resupply services on 18 August 2006. If finger cots are used they may slip off and remain inside the receptive partner. Others had to make do with canvas cots. Using COTS systems reduces development costs and increases system reliability and maintainability. The design using (COTS) components enables procurement of spares worldwide. The standard four-coil extractor spring is replaced with a commercial off-the-shelf (COTS) five-coil spring. The agency distributed cots, water, and food. Motivations for using COTS components include hopes for reduction system whole of life costs.