Of course police officers who graduate from academy have safety concerns as they enter the force. Finding magazines and training on continued safety proceedures is a good and caring gift idea. Helping an officer gain confidence in markemanship or hand to hand interactions can always pay high dividends down the line. Safety is also impacted by being calm so exposure to techniques which help a new police academy graduate stay calm can be useful, Yoga and Meditation come to mind as possibilities.
What ever idea you decide upon to present as a gift at the moment of graduation from police academy remember to thank the new officer for all the efforts they will take to keep family and community safe.