While some programs have seen great successes, others have had difficulties in acquiring the land needed for construction and in maintaining new units.

In September 1953, the 316th Division manned, equipped, trained, and maintained assigned units until April 1960.

The wing mission was to train and maintain tactical flying units in state of readiness in order to defend the northeastern United States.

However, its primary responsibility is to maintain units directly for the defence of the capital.

Their secondary mission is to maintain combat-ready units to deploy on short notice to support operations anywhere in the world.

Many countries throughout the world maintain traditionally-trained and historically uniformed cavalry units for ceremonial, exhibition, or educational purposes.

Also, the legislatures were sometimes willing to help maintain regular British units defending the colonies.

All major combatants maintained traditional units of kite-balloons and airships for point surveillance and reconnaissance.

The Haitian National Police maintains several paramilitary units for defense of the state.

Since then, each service has for both administrative and practical reasons maintained separate units for women.