Atheists and Heathens

The group of Atheists and Heathens Mercenaries (異教徒と無神論者,) was hired by Sir Integra Fairbrook Wingates Hellsing and each member was found by Peter Fargason.

Information
These groups of Atheist and Heathens was hired due to the incident which took place in the Hellsing Manor, caused by the brothers; Jan Valentine and Luke Valentine. Integra also noted that even if they were drawing from the SAS, they wouldn't acquire many skilled soldiers worthy of their trust. Integra also said that trust isn't important at the time, and more manpower is desperately needed.

The group's attires, varies on each person; some wears some accessories on their hat, while some don't. Some also wears vests, and the design of the vests are quite different. There are multiple people that wears green clothing, and multiple people that wears beige clothing. For their weapons, they use an MP5. It is implied that after their training were done, every members wore the usual Hellsing uniform and was placed under Fargason's command.

This groups personality is much like the Wild Geese from the original Hellsing manga, with them not believing in creatures like vampires and such, existing.

In episode 8, Fargason said that there were a total of 74 candidates - implying that there were that many members. However, it seems that these increased as the offers was extended to foreigners specialists with good references, as well as the D-11 and SAS members. Their hiring caused Seras Victoria to move under someone else's division.

Walter C. Dornez, the Hellsing family's butler stated that allowing "Heathens and Atheists" into their "honorable" organisation, such a thing is without precedent in the family.

Death
During Incognito's battle with the Hellsing Organisation in London, specifically - the Tower of London, these members perished and the blood from their corpse was used to revive Alucard.

Trivia

 * In one concept art for the anime, specifically, the one that implied the characters height - Pip Bernadotte was drawn between Seras. So originally, the Wild Geese was gonna appear, however; was replaced.