Changes

*During [[Singularity]], M4A1 was an obtainable drop from the hidden mission of E2 "Survivor" (CN/TW/KR Only), as a means of providing a 'second chance' for players who ignored all in-game warnings and retired their copy of M4A1. Though players can only obtain her through this way once, and those who already have a unit of M4A1 in their arsenal cannot obtain a duplicate through this mean. With the introduction of the index recovery system, this kind of looting system will probably never occur again.

*It was announced during the 5th anniversary festival that M4A1 was both the most [[Affection#OATH|oathed]] Doll and the one most used as an [[Guide:Main Screen|adjutant]].<ref>[https://docs.google.com/document/d/1EkFe5_oF7gM7BA_g2i1IZuchQzKqmua3YOyLmWy-hX0/edit# Girls' Frontline Carnival 2021]</ref>

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