The motto of Umass Lowell Police Department is 'Dedicated to serve those who quest for knowledge.'.
The motto of Lowell High School - San Francisco - is 'Fiat Scientia'.
To protect and to serve.Another View: Many (most?) departments have their own motto and the while the above is popular, it is not a universal answer. For example - the motto of the District of Columbia Metropolitan Police is Justitia Omnibus - 'Justice for All'.
The motto of Metropolitan Police Service is 'metropolitan1'.
The motto of Seattle Police Department is 'Service, Pride, Dedication'.
The motto of Guelph Police Service is 'Pride, Service, Trust'.
Maharashtra Police's motto is 'सदरक्षणाय खलनिग्रहणाय'.
The state motto of Tasmania is "Fertility and Faithfulness".
The motto of Nagpur Police is 'Sadrakshṇāya Khālanīghrahaṇāya'.
The motto of Latur Police is 'सद्रक्षणाय खालनीघ्रहणाय'.
Elite Police's motto is 'Allahu Akbar (disambiguation)'.
Pune Police's motto is 'Safety,Security, Satisfaction'.
The motto of Romanian Police is 'Lex et Honor'.