All 5 Uses

reconnaissance
in
The Three-Body Problem
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In future wars, Red Coast can effectively strike at the enemy's communication and reconnaissance satellites, like the KH-8 spy satellites on which the American Imperialists rely, as well as the KH-9, which are about to be launched.†
p. 157.4
Analysis confirmed that these images came from the KH-9 American reconnaissance system.†
p. 161.4
The KH-9 was without a doubt an important monitoring target, as it presented a rare opportunity to gather more information about American satellite reconnaissance systems.†
p. 161.7
Someone asked, "Reconnaissance and monitoring of Judgment Day have always been the responsibility of NATO military intelligence and the CIA.†
p. 333.3
More than thirty years ago, my reconnaissance squad managed to sneak dozens of kilometers behind Vietnamese lines and capture a hydroelectric station under heavy guard.†
p. 334.9 *

Definitions:

(1) (reconnaissance)
the act of exploring or information produced by such exploration -- especially for military purposes
(2) (meaning too rare to warrant focus)