He said his personal role had been to ensure QRS delivered the infrastructure construction on time and to the highest of standards.
Their work has been ongoing for more than a year and Mr Browne said they would continue to support Rocket Lab in any way they could, "to help Rocket Lab be the success they are".
"It has been a pleasure and a privilege for the staff of QRS to be involved in this extremely historic project; one the staff can be immensely proud.
"In a small way, QRS will always be associated with the history of NZ," Mr Browne said.
QRS typically completes civil and structural engineering construction, maintenance plus utilities and waste management.
In the past they have worked on Affco Meat Processors, Mahia Sewage Scheme as well as earthworks and carpark constructions, among other things.
But this job had been like no other.
The chief executive officer said it would "put the Wairoa District, Hawke's Bay and New Zealand on the global stage and [a]t the forefront of the 22nd century for the grandchildren to come".
He said they were helping to create jobs for the future.