Regular Army

The Regular Army is a military organization from Metal Slug franchise, it's the main army of the franchise and the heroic one.

Peregrine Falcons

 * Marco Rossi (Leader)
 * Tarma Roving (Commander)
 * Trevor Spacey (Commander)
 * Tyra Elson
 * Gimlet

S.P.A.R.R.O.W.S.

 * Eri Kasamoto (Leader)
 * Fio Germi (Master Sergeant)
 * Nadia Cassel (Private)
 * Red Eye (Any rank that is found in Metal Slug 1st Mission and 2nd Mission)

Ikari Warriors

 * Heidern (Leader)
 * Ralf Jones (Colonel)
 * Nathalie Neo
 * Clark Still (Major)
 * Leona Heidern (Private)
 * Roberto Nicola
 * Whip (Staff Sergeant)

Future Regular Army (Metal Slug 13)

 * Elena (Leader)
 * Licht (Master Sergeant)
 * Mello (Commander)

Other Members/Relatives

 * Rumi Aikawa (Sergeant and Supplier)
 * Madoka Aikawa (Private and Supplier)
 * Hyakutaro Ichimonji (2nd Lieutenant)
 * Tequila (Cover Agent)
 * Alisa Stewart (Engineer)
 * Midori (Junior Engineer and Mechanic)
 * MS-Alice (Regular Army's A.I. created by Marco)
 * Matilda (Scientist)
 * Navel
 * Selina (Merchant and Supplier)
 * Rita
 * Amber
 * Perche
 * Nikita
 * Reika
 * Vanessa (Hired by Heidern)

Drill Instructors

 * Sophia
 * Margaret
 * Lilly
 * Mary
 * Cynthia

Affiliated With

 * Rebel Army (Metal Slug 2/X, Metal Slug 3, Metal Slug 6, Metal Slug 8 (Ouroburos.TheNewSaurian), Metal Slug 8 (TheProjectXZoneFan1997) and Metal Slug 12)
 * Ptolemaic Army (Metal Slug Attack (Non-Canon) and Metal Slug 14 (Only joining forces with Sisilia to defeat Rebel Army)
 * Mars People (Metal Slug 6 and Metal Slug Attack (Non-Canon))
 * Invaders (Metal Slug Attack (Non-Canon))
 * Shinra (Project X Zone 3: Sacred Destinies)
 * Kouryuuji Estate (Project X Zone 3: Sacred Destinies)
 * Mishima Zaibatsu (Project X Zone 3: Sacred Destinies)
 * G-Corporation (Project X Zone 3: Sacred Destinies)
 * Fenrir (Project X Zone 3: Sacred Destinies)
 * 765 Productions (Project X Zone 3: Sacred Destinies)
 * Capsule Corporation (Project X Zone 3: Sacred Destinies)
 * Straw Hat Pirates (Project X Zone 3: Sacred Destinies)
 * Uzumaki Clan (Project X Zone 3: Sacred Destinies)
 * ICPO (Project X Zone 3: Sacred Destinies)
 * Maverick Hunters (Project X Zone 3: Sacred Destinies)
 * B.S.A.A. (Project X Zone 3: Sacred Destinies)
 * Passione (Project X Zone 3: Sacred Destinies)
 * Imperial Flower Assault (Project X Zone 3: Sacred Destinies)
 * Space Channel 5 (Project X Zone 3: Sacred Destinies)
 * Nameless (Project X Zone 3: Sacred Destinies)
 * Bionis (Project X Zone 3: Sacred Destinies)

Enemies With

 * Rebel Army
 * Arabian Infantry
 * Japanese Infantry
 * Amadeus Syndicate
 * Mars People
 * Ptolemaic Army
 * Oguma Corporation
 * Invaders
 * Phantom Shadows (Metal Slug 8 (TheProjectXZoneFan1997))
 * WAREZ (Neo Geo Battle Coliseum and its sequel)
 * Xenomorph (Metal Slug vs Aliens and Project X Zone 3: Sacred Destinies)
 * Ouma (Project X Zone 3: Sacred Destinies)
 * Aragami (Project X Zone 3: Sacred Destinies)
 * Time Breakers (Project X Zone 3: Sacred Destinies)
 * Donquixote Pirates (Project X Zone 3: Sacred Destinies)
 * Marine (Project X Zone 3: Sacred Destinies)
 * Uchiha Clan (Project X Zone 3: Sacred Destinies)
 * Shadowloo (Project X Zone 3: Sacred Destinies)
 * Mavericks (Project X Zone 3: Sacred Destinies)
 * B.o.W. (Project X Zone 3: Sacred Destinies)
 * Umbrella (Project X Zone 3: Sacred Destinies)
 * Yautja (Project X Zone 3: Sacred Destinies)
 * Eggman Empire (Project X Zone 3: Sacred Destinies)
 * Rhythm Rogues (Project X Zone 3: Sacred Destinies)
 * Kouma (Project X Zone 3: Sacred Destinies)
 * East European Empire (Project X Zone 3: Sacred Destinies)
 * Mechonis (Project X Zone 3: Sacred Destinies)

Game Ideas Appearances

 * Metal Slug 8
 * Metal Slug 8
 * Metal Slug 8
 * Metal Slug 9
 * Metal Slug 1X0
 * Metal Slug 11
 * Metal Slug 12
 * Metal Slug 13
 * Metal Slug 14
 * Metal Slug Fighters
 * Metal Slug Anthology 2: The War Continues
 * The King of Fighters XV
 * The King of Fighters XV (TheProjectXZoneFan1997)
 * The King of Fighters 15
 * The King of Fighters: Redux
 * Neo Geo 2: Match of the Century
 * Project X Zone 3: Sacred Destinies
 * Project X Zone 4: Fate at Hands
 * Super X Dimensions
 * Divine X Union