VATICAN CITY — The world’s oldest standing army is getting some new headgear.

The Swiss Guards plan to replace their metal helmets with plastic PVC ones made with a 3-D printer, giving the pope’s army cooler and more comfortable headgear when standing guard for hours at a time.

The Swiss Guards unveiled the helmet prototype before their annual swearing-in ceremony Sunday. Thirty-two new recruits – all of them single Swiss men under age 30 and upstanding Catholics – will join the small corps for a minimum two years by pledging to protect the pope and his successors.

The new helmets won’t be donned Sunday, because more formal helmets are used for the elaborate, pomp-filled swearing-in ceremony in the San Damaso courtyard of the Apostolic Palace.

But Swiss Guard spokesman Sgt. Urs Breitenmoser said the Guards hope to replace their existing metal helmets by next year if they can find sponsors to pay for the new ones, which cost around $957 apiece, half the cost of the old ones.

The Swiss Guards are famous for their billowy blue, red and yellow striped uniforms. According to a history on the Guards’ website, the “Gala Uniform” as it is known was designed by Commander Jules Repond in the early 1900s and is based on the colors of the Medici family.

It’s only one of several outfits the guards wear.