Metal Slug: 2nd Mission - Neo Geo Pocket - How to get Metal Knuckle and E-Armor

The title says it..while retrieving hostages - the last two of them in the list precisely - you will be rewarded with two low range & powerful weapons: Metal Knucle (for Gimlet) and E-Armor (for Red Eye). Since the path to reach these hostages is a little hidden, here's a mini-guide that explain where and how get the job done!