Com Tower

Com Towers (short for "communication towers") are a property for enhancing the skills of units.

In-depth
Com Towers give three terrain stars.

In Advance Wars: Dual Strike, they give any army that captures them a 10% attack boost per tower, which can be increased to 15% with the skill rank "Tower Power". In addition, Javier's units get a 10% defense boost for every com tower he possesses.

In Dual Strike, Lash's ground units get a 15% attack boost on Com Towers. Kindle's ground and air units get a 40% attack boost while on com towers. The attack boost Kindle gains stacks with her "High Society" power, meaning that units under the effects of her Super Power get 13% more firepower per tower..

In Days of Ruin, com towers provide a 10% defense boost and income as well as an attack boost. They also provide a hiding place for ground units, and can only be revealed either when an enemy unit moves past the city or if they're in the vision range of one of Lin's ground units when she uses her CO Power.