The Mars Intelligence, Surveillance, and Reconnaissance (ISR) Probe known as “Percival” was developed in a rapid design process and launched. Percival was successful in reaching the planet and returning valuable ISR. Unfortunately, once reaching the planet all contact was lost with the probe. Analysis of final mission transmissions indicate that the probe sustained progressive failure indicative of attack rather than systems failure.

This report was developed in order to maintain a complete record of the mission history, concept development, mission design components, mission implementation, data retrieved, and data analysis. The authors would like to emphasize here that extreme attention to detail is given where available so that as much data as possible is available if further analysis of the Neighborhood Watch project is made.

The report begins with initial findings that led to the creation of the Neighborhood Watch program. The findings began with analysis of data from ground and space telescopes by astronomers at the Space Telescope Science Institute (STScI). There were also reports from various amateur astronomers claiming that Mars was “changing colors”. It was at this point that sequential failures of Mars probes began to alert government officials to the possibility of non-natural actions or activities. A timeline will be given of the sequence of these events.

The next section of the report gives a detailed description of the Percival development effort. Space mission concept architecture, spacecraft design components, and all aspects of the development and implementation of the Mars ISR Probe, Percival, is discussed.