Which action is a civic responsibility but not a civic obligation?

The action that is a civic responsibility but not a civic obligation is the vote.

Explanation:

The eligibility of an individual to vote is included in the constitution and regulated at the state level. The constitution establishes that the right to suffrage can not be denied for reasons of ethnicity, sex or age for citizens over 18 years of age. Beyond these basic qualifications, the statutes of state legislation have the responsibility to regulate voter eligibility. States prohibit voting criminals who are serving a sentence for some period of time or indefinitely. The number of US adults who are prevented from voting for being convicted of serious crimes is estimated at 5.3 million.

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans