March 5, 1836: Davy Crockett kills General Santa Anna with a single 600-yard rifle shot. The Alamo still falls to the Mexican Army, but Crockett escapes to join Sam Houston. The delay at the Alamo gives Houston time to prepare.
July 4, 1947: Lieutenant Gene Roddenberry, a young Texas Air Militia pilot, shoots down an unidentified flying disk near Roswell, western-most city in the Federated States of Texas. Agents from the United States, the California Republic, the Franco-Mexican Empire, and the Third-and-a-Half Reich all want to learn the flying disk's secrets.
Gene Roddenberry is one of many familiar characters in this alternate history tale. The book is printed in black & white, but you can read the entire story, in color, online or just the sequence of pages and the closeup featuring Lt Roddenberry.
I just ordered an as-new b/w book version from an Amazon second hand market seller, as Amazon itself is still awaiting stock.