METAL SLUG ANTHOLOGY

In order to "rescue" a prisoner in a level, you must free them from their captivity AND finish the level without dying after getting them or else they become recaptured and you lose them from your count towards your end total. You can still get the trophy if you lose prisoners during your level playthrough as long as you have 10 by the time you finish the level.

The first level is probably the easiest to get this trophy as the level itself isn't that difficult to complete without dying. The location of the mission's prisoners are as follows:
 

(Note: The video shows the locations of all the prisoners throughout the level even if I don't have them all still saved by the end)

• 1 & 2: You will come across them near the beginning of the level, one is on top of a hill and the other below a little further ahead on a lower one
• 3: He will be on a little hill after you go through the wreckage of a plane
• 4: After blowing up the boat with the big DANGER barrell on it (in the huts), he will be hanging from the hut wreckage just past there, simply shoot him down
• 5-6: When going up the hills with the waterfalls, stop on the second incline and fire up around there and he will drop (I believe two drop but I only ever saw one, either way, you should get credited for 2 from this drop)
• 7-8: Same area, just a little further up right under the second waterfall, aim up and shoot them down
• 9-10: Up on the top section where you fight the end level boss, the one on the right will drop down to the bottom level, but the one of the left will run back and forth up there until the boss is defeated and then he will fall to you as his platform blows up