warrior ethos

https://en.wikipedia.org/wiki/Spartan_army

The Spartan army was the principal ground force of Sparta. It stood at the center of the ancient Greek city-state, consisting of citizens trained in the disciplines and honor of a warrior society.[1] Subjected to military drills since early manhood, the Spartans became one of the most feared and formidable military forces in the Greek world, attaining legendary status in their wars against Persia. At the height of Sparta’s power—between the 6th and 4th centuries BC—other Greeks commonly accepted that “one Spartan was worth several men of any other state.”[1]

https://en.wikipedia.org/wiki/Homosexuality_in_the_militaries_of_ancient_Greece

Homosexuality in the militaries of ancient Greece was a significant aspect across the ancient Greek city-states, ranging from being a core part of military life to being an accepted practice of some individual soldiers. It was regarded as contributing to morale.[1] Although the primary example is the Sacred Band of Thebes, a unit said to have been formed of same-sex couples, the Spartan tradition of military heroism has also been explained in light of strong emotional bonds resulting from homosexual relationships.[2] Various ancient Greek sources record incidents of courage in battle and interpret them as motivated by homoerotic bonds.

https://en.wikipedia.org/wiki/Homosexuality_in_Japan

Samurai shudō

In contrast to the norms in religious circles, in the warrior (samurai) class it was customary for a boy in the wakashū age category to undergo training in the martial arts by apprenticing to a more experienced adult man. According to Furukawa, the relationship was based on the model of a typically older nenja, paired with a typically younger chigo.[1] The man was permitted, if the boy agreed, to take the boy as his lover until he came of age; this relationship, often formalized in a “brotherhood contract”,[12] was expected to be exclusive, with both partners swearing to take no other (male) lovers.

This practice, along with clerical pederasty, developed into the codified system of age-structured homosexuality known as shudō, abbreviated from wakashūdō, the “way (Tao) of wakashū”.[14] The older partner, in the role of nenja, would teach the chigo martial skills, warrior etiquette, and the samurai code of honor, while his desire to be a good role model for his chigo would lead him to behave more honorably himself; thus a shudō relationship was considered to have a “mutually ennobling effect”.[14] In addition, both parties were expected to be loyal unto death, and to assist the other both in feudal duties and in honor-driven obligations such as duels and vendettas. Although sex between the couple was expected to end when the boy came of age, the relationship would, ideally, develop into a lifelong bond of friendship. At the same time, sexual activity with women was not barred (for either party), and once the boy came of age, both were free to seek other wakashū lovers.

Like later Edo same-sex practices, samurai shudō was strictly role-defined; the nenja was seen as the active, desiring, penetrative partner, while the younger, sexually receptive wakashū was considered to submit to the nenja’s attentions out of love, loyalty, and affection, rather than sexual desire[1]d] Among the samurai class, adult men were (by definition) not permitted to take the wakashū role; only preadult boys (or, later, lower-class men) were considered legitimate targets of homosexual desire. In some cases, shudō relationships arose between boys of similar ages, but the parties were still divided into nenja and wakashū roles.[1]

I mean, if you asked me to make a list of militaries with a long-lasting reputation for military culture that echoes down even to today, those would be pretty high on my list.