November 20, 1998 -- The Zarya Control Module was launched atop a Russian Proton rocket. Zarya provides battery power and fuel storage.
Dec. 4, 1998 -- Space Shuttle Endeavour delivered the Unity Node with two pressurized mating adapters. The STS-88 crew captured Zarya and mated it with the Unity Node.
May 27, 1999 -- Space Shuttle Discovery with the STS-96 crew delivered and outfitted the Station with logistics and supplies.
May 19, 2000 -- The STS-101 crew readied the Station for the arrival of the Zvezda Service Module.
July 12, 2000 -- The Zvezda Service Module launched atop a Russian Proton rocket and docked to the Station two weeks later.
Sept. 8, 2000 -- The STS-106 crew delivered supplies and performed maintenance on the Station.
Oct. 11, 2000 -- Arriving aboard Space Shuttle Discovery the STS-92 crew installed the Z1-Truss, a third pressurized mating adapter and a Ku-band antenna.
Oct. 30, 2000 -- The first crew to live and work aboard the International Space Station launched aboard a Soyuz spacecraft.
Nov. 30, 2000 -- The STS-97 crew delivered and installed the P-6 Truss which supports the first U.S. solar arrays.
Feb. 7, 2001 -- The STS-98 crew installed the new Destiny Laboratory Module after removing it from Space Shuttle Atlantis' payload bay.
March 8, 2001 -- Space Shuttle Discovery resupplied the Station with cargo from the Italian-built Leonardo Multi-Purpose Logistics Module. The Shuttle also arrived with the Expedition Two crew and returned Expedition One home.
April 19, 2001 -- Space Shuttle Endeavour delivered racks to the Destiny Laboratory with the Raffaello Multi-Purpose Logistics Module. Canadarm 2, the Station's robotic arm, walked off the Shuttle to its new home.
July 12, 2001 -- The STS-104 crew used the Space Shuttle Atlantis' robotic arm to install the new Joint Airlock from which both Russian and American spacewalks may take place.
Aug. 10, 2001 -- Space Shuttle Discovery transferred Station crews bringing Expedition Three to their new home and taking home Expedition Two.
Sept. 14, 2001 -- A Russian Soyuz rocket delivered a cargo crane and the Russian Pirs Docking Compartment for both a Soyuz docking port and Russian-based spacewalks.
Dec. 5, 2001 -- Space Shuttle Endeavour delivered experiment racks inside the Multi-Purpose Logistics Module that were installed in the Destiny Laboratory.
April 8, 2002 -- Space Shuttle Atlantis delivered the S0-Truss and the Mobile Transporter, which the STS-110 crew installed. The Mobile Transporter gives extra mobility to the Canadarm2.
June 5, 2002 -- Space Shuttle Endeavour, with a Multi-Purpose Logistics Module, delivered more payload and experiment racks to the Destiny Laboratory. The Mobile Base System was also installed completing the Station's Mobile Servicing System.
Oct. 7, 2002 -- Space Shuttle Atlantis delivered the first starboard truss segment, the S1 Truss, which the STS-112 crew installed.
Nov. 23, 2002 -- Space Shuttle Endeavour delivered the first port truss segment, the P1 Truss, which the STS-113 crew installed. The P6 solar arrays were deployed and its batteries were activated.
July 26, 2005 -- The Space Shuttle Discovery's Return to Flight mission carried supplies and equipment inside the Raffaello Multi-Purpose Logistics Module to the station. A faulty Control Moment Gyro was removed and replaced.
July 4, 2006 -- Space Shuttle Discovery delivered supplies and equipment inside the Leonardo Multi-Purpose Logistics Module to the International Space Station. The station was returned to a three crew member capacity with the addition of European Space Agency Astronaut Thomas Reiter to Expedition 13.
Sept. 9, 2006 -- Space Shuttle Atlantis delivered the P3/P4 truss structure to the International Space Station. Four spacewalkers over three spacewalks helped install the P3/P4. The solar arrays and radiator were also deployed
Dec. 9, 2006 -- The STS-116 crew delivered and installed the third port truss segment, the P5 Truss, and attached it to the second port truss segment, the P3/P4 Truss. Space Shuttle Discovery delivered logistics and supplies inside a SPACEHAB single cargo module.
June 8, 2007 -- The STS-117 crew delivered the second and third starboard truss segments (S3/S4) and another pair of solar arrays to the space station. STS-117 also carried Expedition 15 Flight Engineer Clayton C. Anderson to the station and returned Expedition 15 Flight Engineer Sunita L. Williams to Earth.
Aug. 8, 2007 -- The STS-118 crew delivered and installed the third starboard truss segment, the ITS S5 Truss. A SPACEHAB single cargo module delivered supplies and equipment to the International Space Station.
Oct. 23, 2007 --- STS-120 delivered the Harmony Node 2 which was later installed to the forward end of the Destiny Laboratory. The Node 2 provides attach points for the European Columbus laboratory and the Japanese Kibo laboratory. The Port 6 truss structure was also moved from atop the International Space Station's Z1 truss to the end of the Port 5 truss structure.
Feb. 7, 2008 --- The STS-122 crew delivered and installed the European Space Agency's Columbus laboratory. Atlantis also carried European Space Agency astronaut Léopold Eyharts to the complex and returned Expedition 16 Flight Engineer Dan Tani to Earth.
March 11, 2008 --- Endeavour delivered the first pressurized component of the Japanese Kibo laboratory, the Experiment Logistics Module - Pressurized Section, to the station. The mission also delivered NASA astronaut Garrett Reisman to the station and returned European Space Agency astronaut Léopold Eyharts to Earth. In addition, the STS-123 crew delivered a Canadian robotic device called Dextre to the complex.
May 31, 2008 --- The STS-124 crew delivered the Pressurized Module and robotic arm of the Japanese Kibo laboratory, to the International Space Station. The mission also performed an exchange of station crew members. Astronaut Greg Chamitoff flew to the station as a mission specialist on STS-124. He took astronaut Garrett Reisman's place as an Expedition 17 flight engineer.
Nov. 14, 2008 --- Space shuttle Endeavour delivered supplies and equipment, including additional crew quarters, exercise equipment, equipment for the regenerative life support system and spare hardware, inside the Leonardo Multi-Purpose Logistics Module. The STS-126 mission also carried astronaut Sandra Magnus to the complex and returned astronaut Gregory Chamitoff to Earth.
March 15, 2009 --- The STS-119 crew of space shuttle Discovery delivered and installed the International Space Station's final, major U.S. truss segment, Starboard 6 (S6), and its final pair of power-generating solar array wings. STS-119 also carried Japan Aerospace Exploration Agency astronaut Koichi Wakata to the station and returned NASA astronaut Sandra Magnus to Earth.
July 15, 2009 --- Endeavour set sail on its 23rd mission with the Kibo Japanese Experiment Module Exposed Facility and Experiment Logistics Module Exposed Section. The facility provides a type of "front porch" for experiments in the exposed environment, and a robotic arm that is attached to the Kibo Pressurized Module and is used to position experiments outside the station. The mission included five spacewalks.
Aug. 28, 2009 --- Discovery carried the Leonardo Multi-Purpose Logistics Module containing life support racks and science racks. The Lightweight Multi-Purpose Experiment Support Structure Carrier was also launched in Discovery's payload bay. STS-128 also swapped shuttle crew member Nicole Stott for station flight engineer Tim Kopra. Kopra rode Discovery home after two months in space.
Nov. 10, 2009 --- The Mini-Research Module-2 (MRM2) launched Nov. 10, 2009, atop a Soyuz booster rocket from the Baikonur Cosmodrome in Kazakhstan and docked to the station's Zvezda service module Nov. 12. MRM2 serves as an additional docking port for Russian vehicles, as an airlock for Russian-based spacewalks and as a platform for external science experiments.
Nov. 16, 2009 --- The STS-129 crew returned International Space Station crew member Nicole Stott to Earth. STS-129 was the final space shuttle crew rotation flight to or from the space station. Space shuttle Atlantis also delivered parts to the space station, including a spare gyroscope. The mission featured three spacewalks.
Feb. 8, 2010 -- Endeavour delivered Node 3, named Tranquility, to the International Space Station. Tranquility is a pressurized module that provides room for many of the space station's life support systems. Attached to the node is a seven-windowed cupola to be used as a control room for robotics.
April 5, 2010 -- Discovery delivered the Leonardo Multi-Purpose Logistics Module filled with science racks that were transferred to laboratories on the International Space Station.
May 14, 2010 --- Space shuttle Atlantis launched on its final planned mission to deliver an Integrated Cargo Carrier and the Russian-built Mini-Research Module-1 (MRM1) to the International Space Station. MRM1 provides cargo storage and an additional docking port to the station.
Feb. 24, 2011 --- Space shuttle Discovery launched on its final planned mission to deliver the Permanent Multipurpose Module Leonardo and the EXPRESS Logistics Carrier 4 to the International Space Station as well as equipment and supplies. Among the cargo aboard Leonardo was Robonaut 2, a human upper torso-like robot that could be a precursor of devices to help during spacewalks.