The Institute for Unmanned Space Experiment Free Flyer (USEF) (財団法人無人宇宙実験システム研究開発機構) was a Japanese space agency, which was founded by the Ministry of International Trade and Industry in 1986. Unlike NASDA, ISAS, and NAL, it was not included in the JAXA organization, which was founded in 2003. The chairperson is Ichiro Taniguchi.
In 2012, USEF merged two other organizations—Earth Remote Sensing Data Analysis Center (ERSDAC) and Japan Resources Observation System Organization (JAROS)—to form a new organization Japan Space Systems (J-spacesystems).
The aim of USEF is technology development, especially the testing of commercial off-the-shelf parts (COTS), robotics, material sciences and technology for optical earth observations.
Unlike the JAXA organisation, USEF doesn't have its own launch vehicle. Instead, it has used either the H-IIA, the M-3S, or Russian rockets, so far. However, in 2008, METI mentioned the possibility of USEF developing an air-launched vehicle for small payloads.
The Experiment Re-entry Space System (EXPRESS) is a 745 kg (1,642 lb) satellite for microgravity experiments and testing of re-entry technologies. The project was done in cooperation with ISAS (now JAXA) and DLR of Germany. On January 15, 1995, it was launched on the M-3S. However, due to a problem with the rocket, the orbit was much lower than planned. The re-entry capsule was found later in Ghana.
Unmanned Space Experiment Recovery System (USERS) was launched on the H-IIA on September 10, 2002. The aim of the mission was microgravity experiments to perform the Super-Conductor Material Processing Experiment and also testing of satellite bus technologies. For the first part of the mission, USERS carried a return capsule. It was retrieved successfully on May 29, 2003. The mission of the main orbiter ended during re-entry in 2007.
SERVIS-2 was a 900 kg (1,984 lb) technology test mission with COTS parts. It will continue the experiments done with the first SERVIS satellite. It was launched on June 2, 2010, 01:59 UTC, with the Russian Rockot launch vehicle.
ASNARO-1, the first of "Advanced Satellite with New system Architecture Observation" series, is a 450 kg (992 lb) earth observation satellite. The expected resolution is less than 0.5 meter (1.6 ft) from an SSO orbit. The satellite was launched on 2014 Nov 6 by a Dnepr rocket from Yasniy, Russia.
ASNARO 2 is small x-band radar satellite for earth observation. The satellite was launched on 17 January 2018. 
Test of COTS parts. Follow-up mission to SERVIS 1 and 2. Launch was planned for 2013. Current status of the mission is unclear.
Other technology projects
USEF developed the robotic arm of the ETS-VII project to test docking technology in the 1990s.
- Matsuda, Seiji; Kanai, Hiroshi; Fuji, Takayoshi; Hinada, Motoki; Kaneoka, Mitsuteru (April 28, 2008). "An Affordable Micro Satellite Launch Concept in Japan" (PDF). 6th Responsive Space Conference. Archived from the original (PDF) on February 20, 2012. Retrieved May 27, 2015.
- "EXPRESS: Experiment Re-entry Space System". USEF. Archived from the original on March 7, 2012. Retrieved May 27, 2015.
- "SERVIS: Space Environment Reliability Verification Integrated System". USEF. Archived from the original on March 7, 2012. Retrieved May 27, 2015.
- "USERS: Unmanned Space Experiment Recovery System". USEF. Archived from the original on March 12, 2012. Retrieved May 27, 2015.
- http://www.eurockot.com/alist.asp?cnt%3D20040999%26main%3D5. Retrieved April 4, 2009. Missing or empty
- "実証衛星2号機（SERVIS-2）打ち上げ成功" (PDF) (in Japanese). June 3, 2010. Archived from the original (PDF) on July 16, 2011. Retrieved June 3, 2010.
- "ASNARO: Advanced Satellite with New system Architecture for Observation". USEF. Archived from the original on March 7, 2012. Retrieved May 27, 2015.
- "ЗАПУСК КА "АСНАРО"" [STARTING AS "ASNARO"]. Archived from the original on November 8, 2014. Retrieved November 8, 2014.
- "宇宙基本計画工程表（平成27年度改訂）" [Basic space plan roadmap (Fiscal Year 2015 revision)] (PDF) (in Japanese). Cabinet Office of Japan. December 18, 2015. Retrieved September 7, 2016.
- ftp://220.127.116.11/pub/METI%20Space%20Policy.pdf[permanent dead link]
- Official site