A stealthEcho is a genetically-modified, female human life-force, originating from a specific period of time on the planet Earth, although that specific time is classified.
The DNA Code Updates (DNACU) increase strength, hand-to-eye and foot-to-eye coordination, bone density, in addition to many mental faculties, including intelligence, multi-tasking, memory, reading comprehension, spatial recognition and diplomatic logistics. There is also a strong preponderance to longevity, and the exact ages of the stealthEchos are not known [classified] although it is rumored that more than one of them are several thousand years of age. The creation of first stealthEcho could almost be considered an accident. During the replication phase of DNACU sequencing, instead of an 'x' component and a 'y' component being used, two x's were used, resulting in female genitalia. It is long rumored that she was probably named "stealthEcho0" because of the possibility that stealthpilot0 took her as a mate. The stealthpilots have a propensity to be slightly egotistical and narcissistic, side-effects of the self-preservation coding that is essential to their time-traveling capabilities, thusly, the original stealthEcho was named so after Echo in the story of Echo & Narcissus from ancient Greek mythology. Since Echo is a proper name in that story, the "E" in stealthEcho is capitalized.
Occasionally, a companion or "co-pilot" as it were, is needed for a stealthpilot. This companion is almost always the individual stealthpilot's stealthEcho. Each stealthEcho has a number that corresponds to the stealthpilot's, i.e., stealthpilot1's companion is stealthEcho1. And et cetera.
(a note about capitalization)Edit
For purposes of the automatic formatting of this website, the "s" at the beginning of "stealthEcho" is being capitalized, resulting in "StealthEcho" versus the correct capitalization of "stealthEcho." stealthEcho is never capitalized in its true form, as neither are "stealthpilot" [any of them] nor "stealthcommand." Even at the beginning of a sentence, which purposefully breaks an English grammar rule, stealth____ is not capitalized. The reason for this has more to do with the limitations of the Anglo-Saxon alphabet than anything else.