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They presented records showing that Peterson, who lived in Durham, N.C., bought silencer components online and researched subsonic ammunition, which is quieter than standard rounds.

The venerable A-10, which first flew more than 50 years ago, is a single-seat, subsonic attack aircraft designed to provide close air support to ground troops by attacking enemy armored vehicles.

A crane lifted the Intrepid’s Concorde onto a barge Wednesday for a very subsonic passage to the Brooklyn Navy Yard, where it will be stripped down, sanded and repainted.

Nuclear forces also are being modernized with $37.7 billion on new forces, and $11 billion for a mix of both hypersonic and long-range subsonic weapons that can strike from land, air and sea.

Almost one-third of the Defense Department’s munitions dollars in the new budget would be focused on long-range weaponry — both hypersonic missiles and subsonic weapons.