A few hints and tips follow on how each of the four zones (armys, factorys, mines and rigs) effect the game:
If more than 50% of the sector is occupied by the enemy then you will lose one of your assets for each 'time pass' that occurs. The best solution is to, when 30% is occupied, attack the enemy.
004- "KAMIKAZE" - | 061- "HELICOPTER" | 118- "UNDERTAKER"
007- "LIFEGUARD"- | 064- "BANDMASTER" | 121- "HOBGOBLIN"
010- "TROGLODYTE" | 067- "GUNPOWDER"- | 124- "MANTRAP"
013- "PERISCOPE"- | 070- "ALBATROSS"- | 127- "LEVIATHAN"
016- "TANGERINE"- | 073- "AIRPLANE" - | 130- "FARMHOUSE"
019- "MASTERKEY"- | 076- "HOSPITAL" - | 133- "MANUSCRIPT"
022- "BALLROOM" - | 079- "LOAFSUGAR"- | 136- "BABYSITTER"
025- "RAINBOW" -- | 082- "MOUSETRAP"- | 139- "ASTRONAUT"
028- "MANEATER" - | 085- "NIGHTMARE"- | 142- "PRIMROSE"
031- "DETONATOR"- | 088- "PEACEMAKER" | 145- "CROCODILE"
034- "TREASURER"- | 091- "OLYMPIAD" - | 148- "TAILLIGHT"
037- "CORKSCREW"- | 094- "ROADRUNNER" | 151- "KOKONUT"
040- "MANNEQUIN"- | 097- "TURBOPROP"- | 154- "COMMODORE"
043- "EARTHQUAKE" | 100- "DAMOCLES" - | 157- "GERMANY"
046- "STRAWBERRY" | 103- "HOUSEFLY" - | 160- "BANANA"
049- "APARTMENT"- | 106- "SHEEPMAN" - | 163- "JPSCDFBA"
052- "BLOODSPORT" | 109- "MARATHON" - | 166- "SHOCKWAVE"
055- "ELEVATOR" - | 112- "ICEBREAKER"
058- "GLYCERIN" - | 115- "FAIRYTALE"