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In this book by Robert A. Heinlein, students are taken through the experiences of soldiers fighting an interstellar war against alien foes, chiefly through the eyes of the protagonist, Johnny Rico. The themes include military ethics, the rights and responsibilities of citizenship, and the nature of leadership.

Orson Scott Card's novel centers on Ender Wiggin, a child genius enrolled in Battle School to prepare for an alien threat. The story balances Ender's growth and development with the morality of using children in war and the psychological impacts of leadership and isolation. Themes include the ethics of warfare, the making of a leader, and the concept of the 'other'.

In this novel by Robert A. Heinlein, humanity is at war with an alien species known as the 'Bugs'. The story follows Juan 'Johnny' Rico through his service in the Mobile Infantry, a futuristic military unit equipped with powered armor suits. Major themes include civic duty, the ethics of war, and the nature of responsible citizenship.

Written by Joe Haldeman, this spiritual successor to 'The Forever War', although not a direct sequel, depicts a future Earth threatened by a potential Armageddon and explores the dichotomy between soldiers controlling remote war machines and the civilians who are disconnected from the realities of war. Major themes include the nature of peace, the morality of warfare, and the concept of a 'soldier's conscience'.

This classic by Robert A. Heinlein follows the story of a young infantryman, Johnny Rico, in an interstellar war against the insect-like 'Bugs'. The book delves into themes of duty, citizenship, and moral philosophy within the military, as well as the use of power armor in warfare.

Another novel by Heinlein, it tells the story of a lunar colony's revolt against Earth's oppressive government. While not strictly military sci-fi throughout, it includes detailed descriptions of guerrilla warfare tactics and lunar combat. Key themes are individual liberty, self-reliance, and political ideology.

Jack Campbell's series begins with 'Dauntless', in which Captain John 'Black Jack' Geary must lead a fleet home through enemy territory. The series addresses themes of leadership, honor in combat, and the reality vs. legend of military heroes, alongside deep-space naval tactics.

Written by John Scalzi, this novel focuses on John Perry who joins the army on his seventy-fifth birthday and is rejuvenated to fight for mankind's space colonies. The narrative deals with identity, the worth of an individual, and the cost of eternal youth. Themes include the nature of consciousness, the price of technology, and the human condition.

Written by David Drake, this series of short stories follows a mercenary tank regiment in a future where interstellar warfare is waged with hovercraft, energy weapons, and nuclear artillery. Themes of the series focus on the camaraderie of soldiers, the horrors of war, and the ethical dilemmas faced by mercenaries.

Authored by Joe Haldeman, the book tells the story of William Mandella, a young soldier fighting in an interstellar war against the Taurans. It explores the disorientation of time dilation through space travel and the alienation of soldiers returning from war. Themes of the novel are the inhumanity of war, relativity of time, and changes in society.

John Steakley's novel features Felix, a soldier with a near-supernatural ability to survive in battle. As he confronts the endless waves of the Antwar, we also follow Jack Crow, a space pirate involved in a rebellion. The dual narrative explores the psychological impacts of war, the strength of the human spirit, and the search for meaning.