<p>The first assassination of an NYPD officer since the 1988 ambush of Edward Byrne has rattled the rank-and-file — and prompted cops to adopt drastic “wartime” policing tactics not seen since the 1970s.</p>
<p>“At least two units are to respond to EVERY call, no matter the condition or severity, no matter what type of job is pending, or what the opinion of the patrol supervisor happens to be,” an e-mail widely circulated among cops advised Saturday night.</p>