Use my logic. If all else fails... throw a Valkyr at it
(Unless it's a spy. She's umm.. not very sneaky)
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Well outside of Kuva Fortress and Lua you do not really need a stealthframe to reliable run spy missions. I can run spy with a Rhino and do it in a few minutes with all vaults cleared. There are a lot of alternative ways to get in and do it fast.