The author includes an allusion to allowreaders to recall a familiar text.consider famous veterans.think of armed service professions.remember the fifty states and their capitals. 

An allusion is a reference to a well-known text, event, or figure. The purpose of including an allusion is typically to evoke a familiar text in the reader's mind, thereby enriching the reader's understanding or adding depth to the narrative.

Supplemental Knowledge

An allusion is a literary device in which an author makes indirect reference to people, places, events or literary pieces in order to evoke specific ideas or feelings from readers familiar with these subjects - this technique helps add depth and layers of meaning without lengthy explanations being necessary.
As an allusion, when an author refers to "Pandora's Box," they're making reference to a Greek myth where Pandora opened a box releasing all kinds of bad into the world - leaving only hope within. Such allusions often elicit themes of curiosity, unintended consequences and hope.

Applied Knowledge

Imagine reading a novel where a character faces a moral quandary and mentions feeling "Hamlet-esque." Without needing further explanation, readers familiar with Shakespeare's protagonist understand immediately his internal struggle without needing further clarification from authors or translators.
Consider, as another example, political speeches which refer to crossing "the Rubicon." This phrase alludes to Julius Caesar's historic decision of crossing over into Italy that caused civil war - it signifies bold decisions without backtracking; taking risks without fearing backlash or regret from any outcome.

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