A gynoid is just the term used to refer to female androids or “fembots”. Gynoids are typically female-styled robots and are usually more human-like compared to regular androids, with the accompanying body-proportions. While androids in general are sexless entities, gynoids have wider hips paired with a slimmer waist as well as a more pronounced chest plate (sometimes outright boob armor). This clearly identifies them as ‘feminine personalities’ even when not resembling a human (box shaped robots).
Personally I tend to avoid gynoid designs that are outright humans with mechanical features. Instead, subtle anthro designs are more my speed. Think Alexa with legs.
How do I justify the existence of a gynoid army without a human influence guiding their design? Why would robots willingly make themselves a female military?
By this I mean that humans aren’t responsible for the designing of these robots. They are their own faction, mechanical life-forms if you will. So answers should take into account the robots perspective when designing their military models. That is all. Have fun with this.