Conceptual design using UML notation

This assignment gives you an opportunity to create a complex conceptual design from a textual description. For each of the schemas below:

$1.$ Create an entity relationship diagram for the conceptual design using UML notation. The diagram can be created by hand or via some modeling tool.

$2.$ Create a data dictionary for the entities, relationships and attributes. Make your best guess on the data domain for representing the attributes. $(10$ points$)$

Schema $2$: World Arms Trade $(25$ points for UML$)$

The $$Peace Now!$$ Organization is creating a database to capture the military force of the existing nations of the world. A nation is characterized by its name, population, and country code. A nation may or may not possess military branches. A nation's military is divided into branches such as the Navy, Army, Coast Guard, Air Force, etc. Each military branch is defined by a unique name, and a description. Each existing Nation$$s military branch has a website, number of employees, a date specifying when the number of employees was measured and a monetary budget normalized to Euros.

A nation has citizens. Each citizen has a date of birth, a gender at birth, and an age. A citizen belongs to $1$ nation. A citizen may be a civilian, someone who is not part of the military, while other citizens are engaged in military service. For each military employee, the database tracks an employee id specific to the Nation$$s military branch, the date the employee joined the military and their years of service. The employee id when paired with the Nation$$s military branch will produce a unique id for an individual.

Those who serve in the military are further categorized as either combatants or non$-$combatants. For each combatant, we track the number of offshore battles they have been a part of and the number of injuries they have incurred during these battles. Combatants are divided into $4$ categories Infantry, Special forces, Armour and Mechanized units, and Support roles. Non$-$combatants can be found working in various departments such as Engineering, Robotics, Administration or Service. The department a non$-$combatant works in should be stored in the database.

Each military branch is led by a head officer. A head officer may be a combatant or a non$-$combatant. A head officer can only lead $1$ military branch.

A Nation$$s Military Branch operates with multiple squads. A combatant is assigned to one squad only. A squad consists of multiple combatants. For each squad we track: a squad name, and a base station. A squad is administered by a single combatant. A combatant may or may not lead a squad.