Do not request departing military turboprop or turbojet aircraft (except transport and cargo types) to make radio frequency or radar beacon changes before the aircraft reaches what altitude?

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The key idea here is safety during the initial climb of military departures. When a military turboprop or turbojet (excluding transport and cargo types) lifts off, air traffic control tries to minimize changes to radio frequency or radar beacon settings while the aircraft is in the early, high-workload phase of climb. Waiting until the aircraft has climbed to 2,500 feet gives the pilot a more stable environment to handle a frequency change and allows ATC to manage the transition into the en route structure with better radar tracking and identification.

So, the instruction is best applied after the aircraft reaches 2,500 feet, making that the point at which a frequency change or a new radar beacon/Mode C code can be requested safely.