its return Atlantis was readied as a rescue shuttle for the (at that time) two remaining missions of STS-133 and STS-134. It could be launched on need if there was a problem and if not, it would be stood down. Then, later in 2010, NASA decided to fly the previously provision STS-135 mission and chose Atlantis for the flight given that Discovery and Endeavour were earmarked for STS-133 and STS-134 respectively. The funding was found and a decision was taken to fly STS-135 as the final Space Shuttle mission, with Atlantis as the orbiter. The STS-135 mission launched in July 2011, just over a year after Atlantiss launch on the STS-132 mission. May 15 (Flight Day 2 – TPS survey) The crew members aboard Atlantis began their first full day in space at 08:20 UTC. The day was primarily devoted to inspecting Atlantis thermal protection system, using the shuttle's robotic arm and the Orbiter Boom Sensor System (OBSS) to look for any signs of launch damage. Before the thermal protection checkout began, the crew encountered a problem with the Laser Dynamic Range Imager (LDRI) and the Intensified TV Camera (ITVC), due to a snagged cable in that system's pan and tilt unit. As a result, Mission Control decided to switch to the less-capable backup sensor system: sensor package 2, a laser camera and a digital camera mounted near the end of the OBSS. Sensor package 2 required an additional light source (such as daylight), had a resolution of a few millimeters and could scan at about 2.5 inches per second. The crew followed "late inspection" procedures for surveying, and images of the right wing, the nose cap and much of the left wing were sent to the ground for detailed analysis. Commander Kenneth Ham installed the center-line camera in the Orbiter Docking System (ODS) to help him during Atlantis approach to the ISS. Down on the shuttle's middeck, Good and Bowen spent several hours checking out spacesuits and preparing them for transfer to the station. Reisman spent much of his day working with Antonelli and Ham on the TPS survey. He also assisted with the suit and spacewalk equipment checkouts. The crew furthermore performed the ODS ring extension that would connect the shuttle's docking port to the station's Harmony module. The last portion of the crew's day was spent preparing and checking out all of the tools to be used