Possibly from New Model Army (at Wikipedia) (1645-1660).
New-model Sentence Examples
What have been the driving forces behind the new model?
The lords and the Scots vehemently took Manchester's part; but the Commons eventually sided with Cromwell, appointed Sir Thomas Fairfax general of the New Model Army, and passed two self-denying ordinances, the second of which, ordering all members of both houses to lay down their commissions within forty days, was accepted by the lords on the 3rd of April 1645.
The here it will suffice to say that it established under the cons fitu ~ sovereign people, for the king was to survive merely as the supreme executive official, a wholly new model of government in France, both in Church and State.
He served in the New Model army and became involved with army agitators during 1647.