Yes, it is. Project Blue Book was a real U.S. Air Force investigation into UFOs. 'Broken Arrow' within that context often refers to incidents involving lost or crashed military equipment, which were real events that were investigated as part of Project Blue Book.
Chapter 156, "Mirror Immortal, 10 Days to Gather Enough Beast Blood", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The setup is Mirror Immortal Camp, snow-white three-story bamboo building Top..., but the pressure keeps building through The two chairs at the head of the room were empty, while most people....
Chapter 231, "Daytime Visit to Yang Lu, Whose Side Do We Help?", is the clearest early answer because it turns Whose Side Do's situation into a concrete plot event. The chapter turns that into something concrete by moving from Peng Bo's face showed a hint of bitterness. to The families of his two sworn brothers, Liu He and Qin Gu, had been.... What makes it stick is that the chapter closes with Peng Bo, having ripped the roof open, didn't think much further.
Chapter 209, "Dragonfinch's Cold Blood and Luo Ming's Sense of Loss", is the clearest early answer because it turns Redwood Ridge's situation into a concrete plot event. A useful checkpoint is the way the scene starts with You can just send it here. and follows through with They're here." "Let's go, let's greet them..
Chapter 228, "Justified Campaign, The Infiltration Unveiled (Part 2)", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Zhaoyang is not anything good, and neither is Great Xia, but both... to Lu Sheng continued to walk until he was less than five meters away,....
Chapter 247, "Immortal Wu Xiong, Surrender", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The chapter turns that into something concrete by moving from it hurts, help me, help me!" "Ahhhh...… save me!" "Wuwuwu, save me!"... to Although he successfully dodged, the sword arc's passage caused the....
Chapter 203, "Shock, Prisoner Rules, and What Constitutes Guilt? (Part 2)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. Early on, 5,321 people; 124 captives from the Earth-digging Realm, 821 from the.... By the end, Then I'm not letting go, wasn't planning to anyway..
Chapter 172, "The Match Ends, Continuous Surprises", is the clearest early answer because it turns Hong Tian's situation into a concrete plot event. It opens with Why, is there something you want to tell me?" Seeing Shi Ping's face... and closes on Now there is a shortcut to directly become a Six Department Director,....
Chapter 210, "Hong Yu, Beehive, Observation", is the clearest early answer because it turns Hong Yu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zifeng returning to the nest." "Coming!" From beneath the boulder,... and follows through with Let's see how Luo Ming handles this!" Without showing emotion, Xia....
Chapter 152, "Mirror Immortal's Killing Intent, Who Has Been Framed?", is the clearest early answer because the violence around Xia Hong becomes final instead of hypothetical. The chapter turns that into something concrete by moving from They plan to wipe us out in one fell swoop!" Xia Hong turned back to... to Once the Second Leader arrives with reinforcements, they'll all....
Chapter 197, "Cloud Jiao Advances, Beast Blood Dosage", is the clearest early answer because Beast Blood finally turns buildup into a real advancement. The chapter gives readers a real answer by opening on Qiu Peng fell silent upon hearing the voice, remembering clearly that... and ending on Now, along the eastern and western sides of the four buildings,....