For the purpose of indicating targets, the Japanese in Burma, according
to a very recent British report, use tracer fire from two machine guns, each
aimed at the target. About 30 seconds after the tracer fire has been opened, the
first mortar bomb falls at the intersection of the two streams of bullets. This
method of target indication is fast, accurate, and has the advantage of frequently
spotting targets invisible to the observation post. It is also used against enemy
tanks in daylight.