Global Defence Force is the European port of THE Chiky? B?eigun 2. The game is one of the better budget games around.
Gameplay (taken from Wikipedia)
The game is a third-person shooter featuring large play areas and waves of mecha and giant insects. Players control either a foot soldier (Storm-1) who uses conventional weaponry such as assault and sniper rifles, shotguns, and rocket-propelled grenades or a jetpack-equipped soldier (Pale Wing) who uses energy-based weaponry. Most of the game's missions are cleared by eliminating all enemies present, starting with giant ants on earlier stages and eventually progressing to giant lizard enemies. A number of vehicles such as a tank, helicopter and a hover-bike are available in some missions for players to board and attack enemies with. However, only the Storm-1 unit can use the vehicles.
A total of 300 different weapons are available between the two characters, but players are limited to carrying two weapons during missions. Weapons are unlocked by picking up containers dropped by enemies. Every weapon picked up during play will add a random weapon of the character's to the selection, duplicate weapons are discarded. Armor chips and medical kits, also dropped by enemies, increase the character's maximum possible health and recover lost health respectively.
There are a total of 71 missions spread over 7 environments to play through, the first mission taking place in London. Five difficulty levels are available for each mission. Half-medals are awarded for completing a mission on a set difficulty with either character. Completing the same stage with the other character results in a complete medal. Once a player has collected all the medals for every mission, "Impossible" mode is unlocked.