US O3 Insignia T-Shirt Design
This t-shirt design proudly displays the insignia of a United States Military O-3 rank officer. The design adapts to represent both the Army/Air Force/Space Force/Marine Corps and the Navy/Coast Guard.
Army, Air Force, Space Force, and Marine Corps Design
For the Army, Air Force, Space Force, and Marine Corps, the design features two connected silver bars. These bars are the universally recognized symbol of a Captain (CPT), the O-3 rank in these branches. The two silver bars are displayed prominently, signifying the officer's position within the rank structure.
Navy and Coast Guard Design
The design for the Navy and Coast Guard variants features two parallel gold or silver bars. This design represents a Lieutenant (LT), which is the O-3 rank in these branches. The use of bars, in a different orientation and color, maintains the visual consistency of the O-3 rank identification while differentiating it from the insignia of other ranks.
Overall Design Meaning
The overall design clearly communicates the wearer's affiliation with the US military and their position as an O-3 rank officer. The insignia is a potent symbol of leadership, responsibility, and service, indicating a level of experience and authority. The clean and direct visual language of the bars ensures instant recognition and conveys respect for the individual and the rank held.
Unisex Heavy Cotton T-Shirt
A reliable classic cotton tee built for comfort, durability, and style. This unisex heavy cotton shirt is the perfect everyday staple — soft, structured, and designed to make printed designs look sharp and vibrant.
Product Highlights
- 100% heavy cotton fabric for structure and comfort
- Smooth surface ensures vivid, long-lasting prints
- No side seams for irritation-free wear
- Reinforced shoulders to maintain shape over time
- Classic unisex fit — works for all body types
Fit & Style Notes
Designed with versatility in mind, this tee works as your everyday go-to. Wear it true-to-size for a classic fit, or size up for a relaxed, modern drape. The mid-weight cotton balances softness and structure, making it equally great for layering or wearing on its own.
Style it with jeans, joggers, or skirts — its timeless silhouette makes it easy to dress up or down. Perfect for personal wear, printing, branding, or merch drops.
Size Guide
For best results, measure a t-shirt you already own laid flat and compare the chest width and length to the chart below.
| Size | Width (in) | Length (in) | Sleeve (in) |
|---|---|---|---|
| S | 18.00 | 28.00 | 15.10 |
| M | 20.00 | 29.00 | 16.50 |
| L | 22.00 | 30.00 | 18.00 |
| XL | 24.00 | 31.00 | 19.50 |
| 2XL | 26.00 | 32.00 | 21.00 |
| 3XL | 28.00 | 33.00 | 22.40 |
| 4XL | 30.00 | 34.00 | 23.70 |
| 5XL | 32.00 | 35.00 | 25.00 |
Tip: Compare these measurements with your favorite tee for the best fit.
Care Instructions
- Machine wash cold (max 30°C / 90°F)
- Use non-chlorine bleach only when necessary
- Do not iron directly on printed designs
- Do not dry clean
- Tumble dry on low heat
