Bit & Materials for Plaques

I’ve been asked to make a few plaques for some firefighter buddies and trying to figure out what metal material I need as well as bit recommendations for the center part of the attached image.
WATP-p2790-x

this might help

Amazon.com : Engraving Plates Blank Anodized Aluminum Assortment 15 Piece 3-Colors Gold, Silver, & Black : Arts, Crafts & Sewing

Amazon.com: Blank Large Black-on-Brass Engraving Plate : Home & Kitchen

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Thanks Ken. What bits would you recommend to engrave on these materials?

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I use a diamond drag 90 degrees, or v-bit at depth of.005 to start with

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