Heatseeker
Unlockables
Top Secret Plane & The Big One
To unlock the Top Secret plane and "The Big One" weapon pack, just complete both the Pilot and Ace bonus objectives for the final mission (Mission 4.5-Final Count Down).
"The Big One" weapon pack is the fourth weapon pack for the Top Secret plane. This weapon pack, also, includes a nuclear armed cruise missile, the A-SLAMR. This weapon, however, does not recharge after being fired.
Unlockable How to Unlock The Big One (SR-71 Blackbird's fourth Weapon Pack) Successfully complete the Ace bonus objective. Top Secret plane (SR-71 Blackbird) Successfully complete the Pilot bonus objective. Contributed By: WurdMan.
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