Nanoha in Force
Nanoha, now 25 years old, is back on having missions after taking a leave (in Vivid) and is still an Aerial Tactics Combat Instructor in the HQ Armed Forces. She first appears in chapter 4 of Force, when she meets up with Subaru at a dimension port on Midchilda (though before that, she is also seen in the prologue chapter, when Vivio sees her off on a "business trip"). As they walk together, Nanoha comments that she hasn't worked together with Subaru since Riot Force 6. Subaru asks her opinion on "the new equipment", to which Nanoha expresses moderate approval, saying that she and Vita will have to test them more later. She then asks Subaru about Touma Avenir, whom Subaru introduced to her earlier.
Read more about this topic: Nanoha Takamachi