Not a book, but I've been reading something on 4chan's traditional games (/tg/) board, Strike Witches Quest.
Short: Strike witches - Neuroi + Martians (H.G. Wells, War of the Worlds ones) + Dudes that actually do something + crazy hijinks.
Long: You are a P-61 Black Widow pilot in the USAAF 442nd Night Fighter Squadron, aided by indifference, uncanny luck, and your turret gunner Ian and your radio operator Sean, in an alternate Strike Witches universe where Martians are waging war instead of the Neuroi. After a brief encounter with the 501st Joint Fighter Wing at night, your commanding officer sticks you to day duty, where you shoot down 6 Martian craft before having to emergency land on the 501st's base. Suddenly, command decides to stick you there as a liaison. How will you deal being stuck on a island with a whole bunch of women while trying to teach them the ways of becoming a PILOT, not giving a damn and BOUNCING on others? How will life change on that base? How will the war go? And is your luck just luck, or something else?
From what I've read so far, it's both silly and serious. You should give it a try at least.
http://archive.foolz.us/tg/thread/17545010/http://suptg.thisisnotatrueending.com/archive.html?tags=strike%20witches