You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "lieutenant in army is equivalent to which rank in police?" whose answer is Supervisory Special Agent.
Each document should contain about 30 words, and these documents should contain useful information.

Query: rank structure of the army and police
Useful Output:

Doc 1: Not all branches of the military use the same rank structure. Not all police use the same rank structure.
Doc 2: For officers, promotion begins at Second Lieutenant, with progression to higher ranks like Captain and Major based on time in service,
Doc 3: Officers are the senior leaders of the #USArmy. What are the ranks and, most importantly, what level of responsibility is expected of each?
Doc 4: General Officers · Senior Officers · Junior Officers · Subordinate Officer · Warrant Officers and Senior Non-Commissioned Officers · Junior Non-
Doc 5: Police and firefighters in the US are generally of a paramilitary-style structure, with uniformity, ranks, customs such as salutes, etc.