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This study proposes a systematic framework for optimizing multimodal late fusion in object detection by integrating color space transformations with depth information. We contribute three key elements: (1) the development of the \u201cmilitar-VALID\u201d dataset, a specialized, defense-oriented collection of 6,054 images curated for challenging detection scenarios; (2) a comprehensive statistical evaluation framework comparing four late-fusion algorithms across 247 unique configurations; and (3) the hyperparameter optimization of the optimal fusion configuration through Bayesian search. Leveraging the YOLOv8-small architecture trained on eight parallel color representations (RGB, BGR, Grayscale, HSV, CIELab, YUV, YCrCb, and Depth), we establish that Weighted Boxes Fusion combining RGB, Depth, and HSV modalities delivers statistically significant improvements (\n                    <jats:inline-formula>\n                      <jats:tex-math>$$p \\le 0.001$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    , Cliff\u2019s\n                    <jats:inline-formula>\n                      <jats:tex-math>$$\\delta \\ge 0.8$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    ). Specifically, this configuration achieves a 1.30% increase in mean Average Precision (mAP@50-95), a 3.20% improvement in precision, and a 3.22% enhancement in Average Precision (AP@50) for small objects compared to RGB-only baselines. Statistical analysis highlights the depth maps as the most impactful modality and HSV as the optimal color space complement. This work provides a quantitative framework for multimodal color space fusion in military object detection and discusses its implications for deployment in high-stakes operational environments.\n                  <\/jats:p>","DOI":"10.1007\/s10489-026-07142-z","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T09:33:45Z","timestamp":1771407225000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["To fuse or not to fuse: enhancing military operation object detection with multimodal late fusion and color space optimization"],"prefix":"10.1007","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-9756-4623","authenticated-orcid":false,"given":"Andrzej D.","family":"Dobrzycki","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana M.","family":"Bernardos","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,2,18]]},"reference":[{"key":"7142_CR1","doi-asserted-by":"crossref","unstructured":"Xiao F, Hu S, Shen Y, Fang C, Huang J, He C, Tang L, Yang Z, Li X (2024) A survey of camouflaged object detection and beyond. arxiv:2408.14562","DOI":"10.26599\/AIR.2024.9150044"},{"key":"7142_CR2","doi-asserted-by":"publisher","unstructured":"Hupel T, St\u00fctz P (2022) Adopting hyperspectral anomaly detection for near real-time camouflage detection in multispectral imagery. 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