Some collections specifically document biological brothers serving together, such as the Harper brothers or those buried side-by-side in overseas cemeteries, highlighting the literal and figurative meanings of the term. Narrative and Digital Realism I Miss the Brothers in Arms Series - IGN
Many collections under this title, such as the Unique Collection of Letters and Photographs from WWI, provide a raw look at this phenomenon. These collections often juxtapose the "mud and misery" of the trenches with the "compassion and care" soldiers showed for one another. brothers-in-arms-collection
Books like those by James Holland focus on specific units, such as the Sherwood Rangers tank regiment, illustrating how a military unit evolves into a "community—even a family". brothers-in-arms-collection