The four Welsh police chief constables last year questioned the need for elected commissioners.
Mr Underhill also said there would be a considerable increase in the number of special constables.
Mr Williams pipped Julie Nesbit, who chairs the Constables' Central Committee, for the job.
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The North Yorkshire force currently has just over 150 special constables and almost 200 PCSOs.
Option B will have 30 deputies elected from six districts and 12 parish constables.
Marine constables undertake sea survival training in addition to the standard special constable training.
Police and crime commissioner (PCC) Martyn Underhill said more volunteer special constables would be deployed.
Two of the officers were trainee detective constables while the other was a detective constable.
Police and Crime Commissioner Martyn Underhill has pledged to increase the number of special constables.
Dorset's police chief says more volunteers and special constables can strengthen her force's community links.
Chief constables will be required to disclose pay packages, gifts and hospitality on a national register.
BBC: Police corruption: Gifts and second jobs to go on register
Shahabpur receives only occasional visits from the station's semi-trained constables, who are principally shake-down merchants.
Option B would have 30 deputies elected from six districts and 12 parish constables.
The other reform option has 30 deputies and 12 parish constables elected from six districts.
The Warwickshire police and crime commissioner has pledged to create at least 100 more special constables.
There are currently 250 special constables with plans already in place for an additional 60 posts.
He spoke out in support of the role of the senators and constables in the States.
The force is actively recruiting more special constables and developing its community speedwatch initiative.
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Later this week, chief constables will meet to talk about how best to tackle corruption allegations.
Police and crime commissioners will be able to appoint, and if necessary dismiss, chief constables.
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The commission found constables took on fewer positions of senior responsibility in the assembly.
St Peter Port Constables have put forward redevelopment plans after they expressed concerns about abandoned vehicles in the area.
My native UK has had female Chief Constables, MPs, doctors, professors, judges for some time now.
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Surrey Police has said it will pay new police constables more than the government-set minimum starting salary.
But John Mutton told the BBC the new system would lead to chief constables having more power.
The blast killed mostly daily wage workers, police constables at the scene told The Wall Street Journal.
And many businesses also quite rightly released special constables to help and they performed magnificently as well.
The commissioner will be responsible for the force's budget, and the hiring and firing of chief constables.
The Home Office said decisions on sick leave and restricted duties were made by individual chief constables.
Chief constables in England give warning that enforcing Mr Straw's curfews will require a lot of manpower.
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