Apps like United Defense Tactical.

Here are some great alternatives to United Defense Tactical. by Innovatise GmbH :
Shoot Hunter Survival War
Shoot Hunter Survival War
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Realistic Gun - simulator
Realistic Gun - simulator
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SIERRA 7 - Tactical Shooter
SIERRA 7 - Tactical Shooter
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Ballistic Defense: Missile War
Ballistic Defense: Missile War
★4.5
Tactical Map
Tactical Map
★4.2
Urban Counter Terrorist War
Urban Counter Terrorist War
★4.1
Army Gun
Army Gun
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SWAT: Squad Tactics
SWAT: Squad Tactics
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Counter Warfare Action Shooter
Counter Warfare Action Shooter
★3.8
Future Warfare: Mercenaries
Future Warfare: Mercenaries
★3.6
Shoot Out: Gun Shooting Games
Shoot Out: Gun Shooting Games
★4.4
SWAT Tactical Shooter
SWAT Tactical Shooter
★4.3
Command & Defend
Command & Defend
★4.2
Leo's Gun Defender
Leo's Gun Defender
★4.3
Modern Command
Modern Command
★4.3
Tactical Shots: Shooting Game
Tactical Shots: Shooting Game
★3.8