When you get on to land, move to the beach after you kill the enemy with the air raid.

Move up, you will see three puddles of water (and one hole). Move up to the biggest puddle on the right.

Shoot it twice with the M1 Grand and go to the middle puddle. So the same as you just did to the first puddle. Then go to the hole with no water and shoot it twice.

Stand in that puddle briefly, and do the same with all the other puddles. Shoot the puddle in barbed wire twice, then stand in it briefly.

There is a tree next to a tank on the right, shoot it with the rest of the bullets you have. After several seconds, the screen will shake, and you will hear Lion King voices.

In front of you there will be alien ray guns (if you swap it for your colt, you will only get one weapon).