Reconnaissance Tactical Chain

 is an uncommon necklace available from the PvP vendors.

Obtained from

 * Aquaman in the Magic Wing (Watchtower)
 * Hawkgirl in the Meta Wing (Watchtower)
 * Robin in the Tech Wing (Watchtower)

Trivia
A necklace with PvP item level 82 is a must-have to complete PvP level 82 and unlock PvP level 83 gear at the vendors.

The item is available since game update 25.