Mandatory national service gives citizens more pride in their nation. Citizens become more invested in keeping the country safe and thriving. In countries with deep partisan divides, like the US and UK, mandatory national service would help foster cross-partisan relationships.  Sweden, rated one of the happiest countries in the world, has mandatory national service.  An appreciation and commitment to the country enhance the respect that the citizens have for it. This respect is crucial for the success of the nation's politics and economy.  Mandatory national service helps citizens better understand the sacrifice and process of serving their country.  Citizens' engagement through national service, in turn, promotes voting and increases government to citizen interaction. Mandatory national service would help citizens bond and come together over their shared experiences.
Mandatory service harms the quality of life for citizens and does not promote unity. Racism, sexism, and misogyny would continue to permeate these spaces.  Mandatory national service can cause post-traumatic stress and other disorders in those who are forced to serve.  These disorders do not promote unity or patriotism in citizens, but harms the views of the nation by the citizens.
Rejecting the premises