Prime Minister Shinzo Abe's ruling coalition wants to vote the controversial bills into law after days of heated debate that at times descended into scuffles, tears and tantrums.
Tens of thousands of people have taken to the streets in almost daily rallies, in a show of public anger on a scale rarely seen in Japan.
Today hundreds gathered again outside the parliament in Tokyo.
In fraught scenes uncommon for Japan's normally sedate parliament, opposition lawmakers on Thursday pushed and shoved in a failed bid to stop a committee approving the bills.
The legislation was expected to go to a vote in the full upper house some time today.
Abe has faced fierce criticism for his handling of the bills and there are growing signs the campaign has taken a political toll.
Nationalist Abe wants what he calls a normalisation of Japan's military posture, which has been restricted to narrowly-defined self-defence and aid missions by a pacifist constitution imposed by the US after World War II.
Unable to muster support to amend clauses enshrining pacifism, Abe opted instead to re-interpret the document for the purpose of his bills, ignoring warnings from scholars and lawyers that they are unconstitutional.
Opponents, including a Nobel-Prize winner, popular musicians and other prominent figures, say the changes could fundamentally alter Japan.
But Chief Cabinet Secretary Yoshihide Suga said the wrangling should end, blaming the opposition for wrongly labelling the legislation "war bills".
"We have spent enough time and had enough debate," he told reporters today.
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