What are key literary features and themes explored in Bruce Dawe's poem "Homecoming"?

Bruce Dawes's poem "Homecoming" is about the Australian soldiers who returned from Vietnam in large numbers "in green plastic bags"—that is, they were fallen soldiers. The poem's key theme is the relentlessness and pointlessness of war; it also strongly conveys a sense of what a waste war is by repeatedly describing the dead as if they are disposable ("piled," "green plastic bags," "rolling them out," "tagging").
The structure of the poem helps to emphasize this relentlessness. The poem is comprised entirely of a single run-on sentence without periods or stanza breaks. Parallelism and repetition complement this structure to create a sense that the tide of the dead is overwhelming: "they're zipping them up . . . they're tagging them . . . they're giving them names." A semantic field pertaining to dogs helps create a sense that the "dogs in the frozen sunset," personified here, are mourning the dead. Their muzzles are raised "in mute salute" to greet the "noble jets whining like hounds" bringing the soldiers loyally home.
In the final four lines of the poem, Dawes's use of personification and simile ("telegrams tremble like leaves") alongside metaphor ("the spider grief swings in his bitter geometry," "wide web of suburbs") helps demonstrate how far-reaching an impact all this death has had.