Sami is a CO who specializes in Foot soldiers and capturing properties.
Power: Double Time -- All of Sami's foot soldiers gain 30% increased offense, 10% increased defense, and +1 Movement. All other units gain 10% increased offense and defense.
Super: Victory March -- All of Sami's foot soldiers gain 50% increased offense, 10% increased defense, +2 movement, and the completes capture operations instantly, regardless of property type or unit HP. All other units gain 10% increased offense and defense.
Sami is pretty straight forward. Spam infantry and Mech's early and establish a foot hold on front bases. Using your CO power to quickly move your untis forward is not a bad idea, BUT the end all strategy is her SCO power. Transporting a few infantry behind your opponent's base to quickly capture their HQ can be a quick finish to a long war.
Utilize the extra movement speed of APC's and take the middle of the map before your opponent can.