# Development of an Estimation Formula to Evaluate Mission Motion Suitability of Military Jackets
## 3 Results
### Selection of the Main Mission Motions of the Tracked Vehicle Crew  
A factor analysis was performed on a total of 12 mission motions to extract the main mission actions. After eliminating multicollinearity among driving I, driving II, escaping, seating activity, getting off, and maintenance, the factor analysis was repeated, and a total of two factors were identified. Kaiser-Meyer-Olkin (KMO) was 0.580, Bartlett was at the \(p<0.001\) level, and the cumulative contribution of total common factor variance was 95.01%. Table 5 shows factor analysis results of main mission motions of a tracked vehicle crew. Factor 1 refers to the motions associated with ammunition stowing and has an explanatory power of 48.47% for the mission motions of the tracked vehicle crew, with an internal consistency of 0.956. Factor 1 refers to the motions associated with delivering ammunition to the crew on the tracked vehicle and stowing it inside the tracked vehicle; therefore, it involves all motions related to the ammunition. Factor 2 refers to the motions associated with boarding and entering tracked vehicles and has an explanatory power of 46.54% for the mission motions of tracked vehicle crews, with an internal consistency of 0.922. Motions belonging to Factor 2 may be referred to as mission motions, including the motion of bending the body to get on the vehicle and enter the interior. In summary, the main task actions of the tracked vehicle crew can be divided into motions related to the loading of ammunition (Factor 1) and the action of boarding and entering the vehicle (Factor 2). \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline  & **M1** & **M2** & **M3** & **M4** & **M5** & **M6** & **M7** & **M8** & **M9** & **M10** & **M11** & **M12** \\ \hline
**M1** & 1 & 0.833 **\({}^{**}\) & 0.066 & 0.401 & 0.175 & 0.483 & 0.751 **\({}^{**}\)** & 0.732 **\({}^{**}\)** & 0.829 **\({}^{**}\)** & 0.818 **\({}^{**}\) & 0.873 **\({}^{**}\)** & 0.661\({}^{*}\) \\
**M2** & 0.833 **\({}^{**}\) & 1 & 0.197 & 0.172 & \(-\)0.117 & 0.414 & 0.635 \({}^{*}\) & 0.732 **\({}^{**}\)** & 0.638 **\({}^{*}\) & 0.764 **\({}^{**}\)** & 0.818 **\({}^{**}\) & 0.472 \\
**M3** & 0.066 & 0.197 & 1 & 0.536 & 0.604 & 0.095 & 0.500 & 0.402 & 0.238 & 0.236 & 0.279 & 0.302 \\
**M4** & 0.401 & 0.172 & 0.536 & 1 & 0.829 **\({}^{**}\)** & 0.225 & 0.675 & 0.226 & 0.537 & 0.488 & 0.525 & 0.653 \\
**M5** & 0.175 & \(-\)0.117 & 0.604 **\({}^{**}\)** & 0.829 **\({}^{**}\)** & 1 & 0.254 & 0.547 & 0.241 & 0.503 & 0.345 & 0.345 & 0.609 \({}^{*}\) \\
**M6** & 0.483 & 0.414 & 0.095 & 0.225 & 0.254 & 1 & 0.382 & 0.670 & 0.607 & 0.452 & 0.632 & 0.479 \\
**M7** & 0.751 **\({}^{**}\)** & 0.635 **\({}^{**}\)** & 0.500 & 0.675 & 0.547 & 0.382 & 1 & 0.550 & 0.817 **\({}^{**}\)** & 0.869 **\({}^{**}\) & 0.832 **\({}^{**}\) & 0.851 \\
**M8** & 0.732 **\({}^{**}\)** & 0.732 **\({}^{**}\)** & 0.402 & 0.226 & 0.241 & 0.670 & 0.550 & 1 & 0.689 **\({}^{*}\)** & 0.619 **\({}^{*}\)** & 0.699 **\({}^{*}\) & 0.419 \\
**M9** & 0.829 **\({}^{**}\)** & 0.638 **\({}^{**}\)** & 0.238 & 0.537 & 0.503 & 0.607 & 0.817 **\({}^{**}\)** & 0.689 **\({}^{**}\)** & 1 & 0.793 & 0.897 & 0.876 \\
**M10** & 0.818 **\({}^{**}\)** & 0.764 **\({}^{**}\)** & 0.236 & 0.488 & 0.345 & 0.452 & 0.869 **\({}^{**}\)** & 0.619 **\({}^{*}\) & 0.793 & 1 & 0.875 & 0.773 \\
**M11** & 0.873 **\({}^{**}\)** & 0.818 **\({}^{**}\)** & 0.279 & 0.525 & 0.345 & 0.632 & 0.832 **\({}^{**}\)** & 0.699 **\({}^{**}\)** & 0.897 & 0.875 & 1 & 0.804 \\
**M12** & 0.661 **\({}^{**}\)** & 0.472 & 0.302 & 0.653 **\({}^{**}\)** & 0.609 **\({}^{**}\)** & 0.479 & 0.851 **\({}^{**}\)** & 0.419 & 0.876 & 0.773 & 0.804 & 1 \\ \hline \hline \end{tabular}  
MI: boarding M2: entry; M3: ammunition carrying; M4: ammunition stowing I; M5: ammunition stowing II; M6: ammunition loading M7: sitting activity; M8: escaping; M9: getting off; M10: driving I; M11: driving II; M12: maintenance. Values are correlation coefficients. \(p^{*}<0.05\), \(p^{**}<0.01\), \(p^{**}<0.001\).  
\end{table} 
Table 4: Correlation results between mission motions (\(n=27\)).