This undated photo made available by the Baton Rouge Police Dept. shows police officer Matthew Gerald. Gerald, 41, was killed by a gunman in Baton Rouge, LA., Sunday, July 17, 2016. (Baton Rouge Police Dept. via AP)

Friend: Slain Baton Rouge police officer was ‘made to serve’

Matthew Gerald’s bravery and enthusiasm for his new job — Baton Rouge police officer — was no surprise to Ryan Cabral, who served with Geral…