Instruct: Classify the given review as either positive or negative.
Query: An Outstanding Memoir of a Pilot in the First World War

After a lifetime of avid reading about aviation history, this fine book remains one of my favorites. It is very well written, and readily evokes the thoughts, feelings, and experiences of one of the earliest military pilots. Grinnell- Milne's combat resume was most unusual. Starting out as an observation pilot in 1915, he was forced down by engine trouble.He then spent a very long interval as a POW before successfully escaping and returning to the Western Front in an SE -5a for the war's final months.The author was an excellent observer whose flying experiences gave him great material to work with. The result is a book worth keeping and rereading.