Heinlein wrote for a young audience are commonly called "the Heinlein juveniles", and they feature a mixture of adolescent and adult themes. Many of the issues that he takes on in these books have to do with the kinds of problems that adolescents experience. His protagonists are usually intelligent teenagers who have to make their way in the adult society they see around them. On the surface, they are simple tales of adventure, achievement, and dealing with stupid teachers and jealous peers. Heinlein was a vocal proponent of the notion that juvenile readers were far more sophisticated and able to handle more complex or difficult themes than most people realized. His juvenile stories often had a maturity to them that made them readable for adults. Red Planet, for example, portrays some subversive themes, including a revolution in which young students are involved; his editor demanded substantial changes in this book's discussion of topics such as the use of weapons by children and the misidentified sex of the Martian character. Heinlein was always aware of the editorial limitations put in place by the editors of his novels and stories, and while he observed those restrictions on the surface, was often successful in introducing ideas not often seen in other authors' juvenile SF. In 1957, James Blish wrote that one reason for Heinlein's success "has been the high grade of machinery which goes, today as always, into his story-telling. Heinlein seems to have known from the beginning, as if instinctively, technical lessons about fiction which other writers must learn the hard way (or often enough, never learn). He does not always operate the machinery to the best advantage, but he always seems to be aware of it." The 1972 collection Myths and Modern Man noted 1959–1960 Heinlein decisively ended his juvenile novels with Starship Troopers (1959), a controversial work and his personal riposte to leftists calling for President Dwight D. Eisenhower to stop nuclear testing in 1958. "The 'Patrick Henry' ad shocked 'em", he wrote many years later. "Starship Troopers outraged 'em." Starship Troopers is a coming-of-age story about duty, citizenship, and the role of the military in society. The book portrays a society in which suffrage is earned by demonstrated willingness to place society's interests before one's own, at least for a short time and often under onerous circumstances, in government service; in the case of the protagonist, this was military