Intruder, also known as IOSA (Integrated Overhead SIGINT Architecture) is reported to be the codename for a spy satellite

Spy satellite

A spy satellite is an Earth observation satellite or communications satellite deployed for military or intelligence applications....

 system to be operated by the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 National Reconnaissance Office

National Reconnaissance Office

The National Reconnaissance Office , located in Chantilly, Virginia, is one of the 16 U.S. intelligence agencies. It designs, builds, and operates the spy satellites of the United States government.-Mission:...

, which will replace the current Mentor

Mentor (satellite)

MENTOR, sometimes called Advanced Orion by observers, is reportedly a code-name for a class of United States spy satellites that collect signals intelligence from space...

 and Mercury

Mercury (satellite)

MERCURY is reportedly the name of a series of three United States spy satellites launched in the 1990s. These satellites were launched and operated by the National Reconnaissance Office with the participation of the United States Air Force. Two of the three launches from Cape Canaveral were...

 systems. The satellites were reported to have been under development in 1995. The Intruder system was designed to combine the electronic signals intelligence (ELINT) and communications intelligence (COMINT) roles of signals Intelligence (SIGINT)

SIGINT

Signals intelligence is intelligence-gathering by interception of signals, whether between people , whether involving electronic signals not directly used in communication , or combinations of the two...

 spacecraft, which had previously been performed by different satellites, the Rhyolite

Rhyolite/Aquacade

Rhyolite and later, Aquacade are reportedly code names for a class of SIGINT spy satellites operated by the National Reconnaissance Office for the United States Central Intelligence Agency. The National Security Agency was also reportedly involved...

 and Vortex

Vortex (satellite)

Vortex, previously known as Chalet, is a class of spy satellite operated by the United States during the 1980s and 1990s to collect signals intelligence from high Earth orbit. The Vortex satellites were operated by the National Reconnaissance Office for the United States Air Force and listened to...

 series respectively.

It has been reported that NRO L-26 may be the launch designation for the first Intruder satellite. NRO L-26 was scheduled to launch in 2005 on a Delta IVH from launch complex SLC-37B at the Cape Canaveral Air Force Station

Cape Canaveral Air Force Station

Cape Canaveral Air Force Station is an installation of the United States Air Force Space Command's 45th Space Wing, headquartered at nearby Patrick Air Force Base. Located on Cape Canaveral in the state of Florida, CCAFS is the primary launch head of America's Eastern Range with four launch pads...

, but was delayed due to a number of issues. It launched on 17 January 2009, and subsequently designated USA-202

USA 202

USA 202, previously NRO Launch 26 or NROL-26, is a classified spacecraft which is to be operated by the United States National Reconnaissance Office. It is believed to be either the first Intruder, or an Advanced Orion, ELINT satellite...

.