Cowl-Model Batsuit TacHelm

The Cowl-Model Batsuit TacHelm is the Head armour segment of the Dark Specter Batsuit Iconic Battle Suit.

Source
The Cowl-Model Batsuit TacHelm is can be bought from Batgirl in the JLA Watchtower's Tech Wing

Trivia

 * Prior to Update 18, the armour piece cost 60 Marks of Distinction; earned by completing Tier 2 Duos, by defeating bosses in Tier 2 Alerts, completing the Daily Tier 1 Alert, and completing South Gotham oriented quests only available in The Battle for Earth DLC.