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This is supported by the fact that when we do find another S-unit (4S), he isn't equipped with a weapon like 9S is.
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9S is an exception since he taught/reprogrammed himself to know how to fight so he can defend himself besides hacking, but normally, Scanners aren't made for battle or combat, so putting too many of them out would be wasteful if the machines managed to get to the Scanners before they're able to complete their hacking.
Not to mention that their hacking is supposed to be their only line of defense. Fielding more than absolutely necessary would put the Human Server files under substantial risk, even with androids specifically made to kill them if they learn too much watching them at all times. If Scanner-models like 9S can be so destructive in battle with their combat hacking, why aren't they fielded more often? Because they're not just a threat to machines, their hacking skills are dangerous to the very information whose knowledge would delegitimize the entire android war effort.
Her designation almost certainly isn't 7E on the others' IFF, as the very existence of E-types is highly confidential.
Furthermore, even if 7E had survived the initial assault, it's likely 2B being a fellow E-type is why 7E showed up on her IFF as such (one assumes so the two E-types can coordinate if necessary while on the field, since 7E was implicitly there to keep tabs on 11B, who was planning to desert, while 2E is 9S's designated executioner).