Jango Fett was chosen as the template for the Grand Army of the Republic for a multitude of reasons, each highlighting his unique qualifications that made him an ideal candidate for the Kaminoans. Here's an in-depth look at why Jango Fett was considered the perfect template:

1. Unparalleled Combat Skills
Jango Fett was renowned throughout the galaxy as one of the most skilled bounty hunters. His proficiency in various forms of combat—ranging from hand-to-hand combat to expert marksmanship with blasters—was legendary. This exceptional combat prowess was crucial for the Kaminoans, who needed a template capable of producing soldiers with the ability to excel in diverse and challenging battle scenarios.

2. Physical and Mental Attributes
Jango possessed an exceptional combination of physical strength, agility, endurance, and quick reflexes, all of which are critical for any soldier. His mental attributes were equally impressive; he was highly intelligent, strategic, and capable of making quick decisions under pressure. These traits ensured that the clones would not only be physically capable but also mentally resilient and strategic in battle.

3. Genetic Purity and Stability
Jango’s genetic makeup was found to be particularly stable and adaptable for cloning purposes. The Kaminoans, known for their expertise in genetic engineering, required a source of DNA that would not degrade over multiple generations of clones. Jango’s genes provided a robust foundation for the creation of a vast army, ensuring that each clone would possess the same high-quality attributes as the original.

4. Extensive Experience
Jango’s extensive experience as a bounty hunter meant that he had encountered and overcome a wide variety of combat situations. This experience translated into practical knowledge and skills that could be passed down to the clones, making them versatile and adaptive soldiers. His real-world experience in tracking, hunting, and combat across different environments made him a valuable template.

5. Mandalorian Heritage
Jango’s Mandalorian heritage added an extra layer of combat readiness and discipline. Mandalorians are known for their warrior culture, which emphasizes rigorous combat training and a strong sense of duty and honor. These cultural attributes were desirable for the clones, who would need to be disciplined and effective soldiers.

6. Reputation and Reliability
Jango’s reputation as a highly efficient and reliable bounty hunter played a significant role in his selection. His success rate in bounty hunting missions demonstrated his effectiveness and reliability. The Kaminoans could trust that the clones created from Jango’s template would inherit these traits, ensuring that the Republic’s army would be both reliable and formidable.

7. Agreement and Compliance
Jango agreed to the cloning process under specific terms: a substantial financial reward and an unaltered clone for himself, whom he named Boba Fett. This agreement not only secured Jango’s cooperation but also ensured that the Kaminoans had direct access to their template, facilitating the cloning process. Jango’s compliance and involvement provided the Kaminoans with the necessary oversight to ensure the quality and consistency of the clones.

8. Training and Legacy
Jango’s involvement in the training of the initial batches of clones further cemented his suitability as the template. His hands-on training ensured that the clones inherited not just his genetic traits but also his combat techniques and strategic thinking. This training helped establish a solid foundation for the clones’ development and effectiveness in combat.

9. Contribution to the Clone Wars
The effectiveness of Jango’s clones was proven during the Clone Wars. The clone troopers displayed remarkable discipline, bravery, and skill in battle, often turning the tide in favor of the Republic. Their performance on the battlefield validated the choice of Jango as the template and demonstrated the long-term benefits of using his genetic material.

10. Longevity of the Clone Army
The decision to use Jango’s genetic template had long-term strategic advantages. The stability and quality of his genetic material meant that the Kaminoans could produce multiple generations of clones without significant degradation in quality. This ensured that the Republic could sustain a powerful and effective military force over an extended period.