Weapon systems have broad application to role-playing and
national defense. Many defense technologies have later been
adapted to civilian and aeronautics roles, including mass
manufacturing, plastic, lightweight metals, airplanes, and
nuclear technologies.

Here are two examples of military technologies, specifically
weapon systems, that may be capable of inspiring another
technology, perpetual motion machines:

(1) The OICW, or Objective Infantry Combat Weapon is a
weapon developed relatively recently compared to other rifles
and grenade launchers. It may be based on a drawing I made in
middle school or high school using a similar design:

The concept was to combine a pump grenade launcher with a
fully-automatic assault rifle. In some designs clips could be
disposed through pump action.

The application to perpetual motion is the principle of combining
multiple parts in an integrated way, specifically a way in which
space is given to each feature included in the design. Additionally,
efficiency is an important factor, thus, part of the principle of
multiple features is to streamline the weight profile of each
element included in the final package.

(2) CIWS: Close-In Weapon System: This is another
efficient-in-principle concept, although I did not influence its
design. It is deployed on aircraft carriers as a standing defense
against incoming military aircraft. It takes the form of an
automated Gatling-type gun (sometimes mistakenly called by the
broader name 'chain guns') attached to a large armored drum of

The application to perpetual motion is the principle that a central
design should focus on one or more primary features (e.g. like
aerial defense or shooting), and other features support this role in
a way that can be carefully controlled. Working from primary
functions to secondary functions, to control, and back to
secondary functions, and then back to primary functions becomes
a way of improving strategies of engineering.

(3) Another thing to notice is the Law of Iteration observed during
WWII, which is that speed of iterations often surpasses slower
iterations of a slightly higher quality. In other words, processing
power matters. It is always possible to overcome an obstacle,
given leisure and a willingness to be extreme. The exceptions are
physical impossibilities, thus, there is much advantage in the
intellectual realm, and within the range of understood knowledge.
It also amounts to a rule of creativity. Ninjas understood it as the
rule of adaption.