Sabotage in Space by Carey Rockwell

SABOTAGE IN SPACE is the seventh in the Tom Corbett, Space Cadet series of books.

What started out as an innocent campus prank at Space Academy almost cost the Polaris unit the chance to become officers in the Solar Guard. For punishment, Tom, Roger, and Astro were assigned to spend all their spare time on guard duty in the vicinity of a new building which housed the latest hush-hush project so important to the solar universe.