Definition of augmentee in English:

augmentee

Pronunciation /ˌɔːɡmɛnˈtiː/

noun

US Military
  • A member of the military assigned temporarily to a particular unit in order to cover a shortage of personnel or to provide specialist skills (also more fully "individual augmentee"). Also in more general use: any individual temporarily brought into a team, group, etc.

Origin

1960s; earliest use found in Pacific Stars & Stripes. From augment + -ee.