Де-Аар: Военный арсенал, история и геральдика города.

The South African Defence Force's 97 Ammunition Depot is located outside of De Aar. This is a large facility, and includes 186 magazines and an internal railway system. The South African Army's School of Ammunition is also located at the facility.

De Aar has a semi arid climate (Köppen: BSk) with hot summers and cool winters. Diurnal air temperature variation is high throughout the year, resulting in cool summer nights and frosty winter nights. The average annual precipitation is , with most rainfall occurring during summer and autumn.

By 1931, the De Aar municipal council had adopted a seal like emblem depicting a railway locomotive and the motto Progressus semper surrounded by a circle inscribed "Munisipaliteit – Municipality – De Aar".

By 1952, the municipality had assumed a coat of arms depicting a railway locomotive above a ram's head. The motto was on a riband below the shield.

This design was improved a few years later, and the new version was registered with the Cape Provincial Administration in November 1955. The arms were now : Or, a merino ram's head caboshed proper, a base barry wavy of four Azure and Argent; on a chief Argent a locomotive Sable (i. e. a golden shield displaying, from top to bottom, a black locomotive on a silver background, a ram's head on a golden background, and four wavy stripes alternately blue and silver).

An entirely new coat of arms was registered at the Bureau of Heraldry in March 1986. The arms were : Azure, a pale Argent; on a Chief Gules, a ram's head caboshed Argent, between two wheels Or (i. e. a blue shield with a silver stripe down the middle and, across the top, a red stripe displaying a ram's head between two golden wheels). The crest was an heraldic fountain above a water bouget, and the motto was Semper progressus.