Well, I'm not sure one could argue that the keris "remains" a combat weapon aside from it's use in silat training. One would hardly expect a modern day soldier to use one in war.
But it probably WAS created for this purpose originally and certainly has been used this way in it's time. It appears again and again in Malay legend as well as a combat weapon. What is one to make of the stories of Hang Tauh and the keris Taming Sari?