A mutual interest exists for an inquiry into allegations of unlawful killings by British soldiers in Afghanistan to conclude "in a reasonably swift period", a defence minister has said.
But speaking in Parliament, Baroness Goldie stressed the need not to "compromise the purity of the investigation" or give the impression Whitehall was trying to influence the probe.
The value of the statutory inquiry, to be headed by Lord Justice Haddon-Cave, was its "independence", the Tory frontbencher told peers.
It has been established to investigate allegations of wrongdoing during deliberate detention operations in Afghanistan from mid-2010 to mid-2013.
The inquiry, commissioned by Defence Secretary Ben Wallace and due to start in early 2023, will also focus on the "adequacy of subsequent investigations" by the Ministry of Defence (MOD) into the accusations, including murder.
The issue of timescale was raised by former Liberal Democrat leader Lord Campbell of Pittenweem following a repeat of the statement announcing the probe in the House of Lords.
He pointed out that the Saville Inquiry into the Bloody Sunday atrocity took 12 years, while the Chilcot Inquiry into the Iraq War took seven years to report its findings.
Lord Campbell said: "One appreciates there's a finely balanced tension between detail and getting it right, but also the longer the issue is dragged out the more difficult it may be for people to believe that the word 'expeditiously', which is used in the statement, has any real meaning.
"Perhaps it might be enough to for me suggest that the issue of expeditiously is one which the Ministry of Defence should impress as reasonably as they can for Lord Justice Haddon-Cave when he begins his inquiry in full?"
Responding, Lady Goldie said: "I think there is both a mutual interest on the part of the MOD and the inquiry in trying to come to conclusions without the passage of an unduly excessive period of time.
"The MOD certainly would like to see this concluded expeditiously. I think Lord Justice Haddon-Cave will want to do that."
However, she added: "We don't want to compromise the purity of the investigation with the feeling that we have got a foot on the accelerator just to come up with a result.
"I think that would be a very unfortunate conflict.
"That's why the MOD will be very, very careful about any engagement because we don't want to give the impression that we are trying in any way to influence this inquiry.
"To me, the value of this inquiry is its independence.
"There's a mutual interest I think in everyone hoping that it can get underway with its work, it can review its evidence and it can begin to draw conclusions and recommendations in a reasonably swift period."
The Government has offered assurances to troops and veterans it will give support to anyone called up by the inquiry, as it acknowledged the "dismay and anxiety" it would cause to individuals.