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STS-108 was a Space Shuttle mission to the International Space Station (ISS) flown by Space Shuttle Endeavour. Its primary objective was to deliver supplies to and help maintain the ISS.

STS-108 was the 12th shuttle flight to visit the International Space Station and the first since the installation of the Russian airlock called Pirs on the station. Endeavour delivered the Expedition 4 crew to the orbital outpost. The Expedition 3 crew returned to Earth on Endeavour.

While at the station, the crew conducted one spacewalk and attached the Raffaello Multi-Purpose Logistics Module to the station so that about 2.7 metric tons (3 tons) of equipment and supplies could be unloaded. The crew later returned Raffaello to Endeavour's payload bay for the trip home

SSAF-UF-1 carried the Multi Purpose Logistics Module (MPLM-2) 'Raffaello' (2nd flight) 4th MPLM flight overall. Also the Multiple Application Customized Hitchhiker (MACH-1) MPESS Hitchhiker experiment bridge: with CAPL-3, Starshine-2, SEM-11 & 15, G-0761, Prototype Synchrotron Radiation Detector (PSRD) & COLLIDE-2. As well as the Lightweight MPESS Carrier #2 (LMC) carrying: SEM-12, G-0785, G-0064 and G-0730.

This Mission like many accomplished a number of processes and experiments to include: spacewalk
Spacewalks
Godwin and Tani – EVA 1
EVA 1 start: 10 December 2001 – 17:52 UTC
EVA 1 end: 10 December 2001 – 22:04 UTC
Duration: 4 hours, 12 minutes

EVA: 4 hours, 12 minutes – On 10 December 2001, Endeavour astronauts Linda Godwin and Daniel Tani completed a four-hour, 12-minute spacewalk to install insulation on mechanisms that rotate the International Space Station's main solar arrays.
Maintenance and re-supply
Mission managers extended Endeavour's flight to a duration of 12 days to allow Endeavour's crew to assist with additional maintenance tasks on the station, including work on a treadmill and replacing a failed compressor in one of the air conditioners in the Zvezda Service Module.
IMU failure
On 12 December 2001, the crew and Mission Control noted a transient problem with one of the shuttle's three inertial measurement units (IMUs), the primary navigation units for the shuttle.
Reboost and departure
Flight controllers planned slight changes to Endeavour's departure from the station 15 December 2001, allowing time for a small jet firing by the shuttle to boost the station's future path away from a piece of space debris that could pass near the complex.
Scientific experiments
Endeavour's middeck carried home the results of several experiments completed during Expedition 3's stay on the station. These included the Advanced Protein Crystallization Facility, the Dynamically Controlled Protein Crystal Growth experiment and cells from the Cellular Biotechnology Operations Support System (CBOSS).
Experiments in Endeavour's payload bay were returned for investigators around the world...