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The recruits have completed an initial two week training course, and will now be based at stations across West Sussex.
The service accepts donated scrap cars which are used for training exercises for road traffic collisions.
Fourteen of West Sussex's 25 fire stations are crewed solely by an on-call workforce.
A number of crews took on the challenge at the weekend with funds raised going to the Fire Fighters Charity.
The IRMP, which assesses community risks in West Sussex, has been produced following a six-week consultation earlier this year.
The service is urging people to take care when swimming in the countryside during the summer period.