The model used for the Wandering Mother Base Soldiers is an updated version of the Militaires Sans Frontieres soldier model first seen in Metal Gear Solid V: Ground Zeroes, being dirtied and with the MSF logo etched on the back of the body armor. The first letters of the Wandering Mother Base Soldiers acts as an Easter egg as they spell out 'KJP FOREVER', meaning ' Kojima Productions Forever.' The completion of these 10 side ops award the player with the Memento Photos, which can be shown to Paz on Mother Base. While they will usually flee from Snake, getting too close to them causes them to strike with a swatting motion, which instantly knocks Snake to the floor and leaves him on the brink of unconsciousness. They share the same character animations as the Parasite Unit and Puppet soldiers, staggering as they walk and flailing their arms awkwardly when they run. The Wandering Mother Base Soldiers are featured in the similarly named series of side ops in Metal Gear Solid V: The Phantom Pain. The soldiers each carried memento photos from their time in MSF, which Snake later showed to an 'amnesiac' Paz Ortega Andrade on Mother Base.

Upon being brought over to the new Mother Base, the members were presented with Service Cross medals. By this time, the soldiers had begun exhibiting erratic behavior, with Snake having to extract them by force. Kazuhira Miller recognized them from the old Mother Base, and had Snake bring them 'home' to the new Mother Base of MSF's successors, Diamond Dogs. In 1984, the solders were individually encountered by Venom Snake in both Afghanistan and Africa. After the attack, they scattered but still continued to walk the battlefields.

The soldiers had been members of the mercenary group Militaires Sans Frontières and had been off-site when Mother Base was destroyed by XOF in March 1975.

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