Port Authority Police Department hard hat, World Trade Center : Captain D Bergman, Australian Army

White plastic hard hat with a shield shaped Port Authority Police sticker on the front. In the center of the sticker is an image of the Port Authority Police badge with the coats of arms of New York and New Jersey. Underneath them is the number 37. In the background is a stylised image of the twin towers of the World Trade Center on a light blue background. Surrounding this is a dark blue border with the text 'PORT AUTHORITY POLICE NEW YORK NEW JERSEY' in white. Each side of the hat bears a grey sticker with a stylised image of the twin towers of the World Trade Center, with an American flag in the foreground. The underside of the visor is embossed with manufacturer's details and care instructions.

Hard hat worn by Captain David Bergman, while working at the World Trade Center site in 2001. In late 2001 Bergman was studying Chemical, Biological, Radiological, and Nuclear (CBRN) weapons and hazards in the United States.

Along with four other Australian officers, he was seconded to the New York Police Department (NYPD) from 2 to 25 November 2001 to assist with anthrax / white powder attacks that were occurring in the wake of the terrorist attacks of 11 September 2001. He was deployed as part of the NYPD Hazardous (HAMMER) teams operating across New York City. They would be called out to incidents to investigate and decontaminate areas if required. During November Captain Bergman attended over 30 incidents.

After working with HAMMER, he was then seconded to the Port Authority Police Department (PAPD). He worked four night shifts as part of the PAPD recovery team at Ground Zero at the World Trade Center, New York. He also visited Staten Island human remains recovery site, where all recovered material was taken for sifting, and the morgue where he went through identification techniques used to identify people.

The number 37 on the helmet's front sticker commemorates the 37 members of the PAPD who were killed on 11 September. Of the 37 killed, the bodies of 16 were never recovered. Also killed from the PAPD was Sirius K-9, one of their explosives detection dogs.