Trench Whistle

 is a Tier 5 Tank that upgrades from Lieutenant and Airhorn at level 60.

Design
The looks identical to the Lieutenant but it gains the small rear decoration that Airhorn and its branch has, indicating its special blocks.

Technical
Like the Airhorn, the 's blocks have four Machine Gun-like cannons on their flat sides.

Trivia

 * This tank was an idea by Fourche7.
 * Trench whistles were tools used by commanding officials in WW1 to initiate attacks.