Andy Springthorpe, a sergeant with West Midlands Police, said: "It's not just about our pensions, it's about the changes the Government wants to impose that will fundamentally change the way we police our communities.
"Why repair something that isn't broken? It's very frustrating."
Sgt Springthorpe, who has been a policeman for more than 22 years, said his force was subject to Regulation A19, meaning that officers with more than 30 years of service are forced to retire.
Inspector Eddie Boyle, who has 28 years' service and currently works for West Midlands Police, said: "We appreciate the situation the Government is in financially and we want to play our part in addressing it. But we almost feel like it's a personal attack on the police service."
To read more about West Midlands Police officers who took part in the march visit ITV Central.
Official metres numbers 35000! Outstanding! SJWFrom @PoliceFedICC on Twitter:
More than 20,000 off-duty police officers took to the streets today as they warned that Government cuts are putting public safety at risk. The officers, from all 43 forces across England and Wales, donned black baseball caps with the words "Cuts are criminal" as they marched through central London.
30,000 cops marching in London. Figures from Met control room. GSFrom @PoliceFedICC on Twitter:
Numbers increasing on police march. GSFrom @PoliceFedICC on Twitter:
The Shadow Home Secretary has told ITV News that today's police demonstration shows the "scale of damage" that the government is doing to policing, and that communities will "pay the price" for the cuts introduced.
Paul McKeever, Chairman of the Police Federation of England and Wales has told ITV News that police were being treated "less favourably" than others in the public sector with a 4 year pay-freeze, as well as cuts to pensions.