Final answer:
Sergeant 1st Class is a military service rank, but the provided information does not specify its insignia. In real-world contexts, military insignias for such a rank would differ between forces and countries.
Step-by-step explanation:
The rank of Sergeant 1st Class falls under the category of military service. According to the information provided, various insignias are used to represent different ranks within civil and military services. In the context where cranes and leopards are used as motifs, if one crane indicates a Rank 4-9 official, which is considered low ranking, then military ranks such as Sergeant 1st Class would likely be represented by a different symbol, perhaps akin to the leopard mentioned for military service. However, without the exact representation for this specific rank, it is not possible to provide a precise description of the Sergeant 1st Class insignia. It is important to note that in real-world military rankings, the insignias can vary significantly between different countries and armed forces.