context : told from wife's perspective - deals with PTSD and its impact on the soldier and his wife
structure: organised in couplets, reflects the couple's harmony when they were first united. as the poem progresses, the rhyme scheme falters, reflecting the increasingly disjointed nature of their relationship
"blown hinge of his lower jaw" - metaphor suggests his jaw is physically and metaphorically broken - he's no longer open with her, perhaps unable to share his feelings and experiences
"fractured rubber of shoulder blade" - he can't "steer" himself, she has to guide him