The DW5600UBB-1 mil-spec watch in a freeze/thaw simulation.

The freeze/thaw test demonstrates the reliability of the DW5600 series design. During freeze/thaw testing, the watch was repeatedly cycled from 22°C (72°F) down to -11°C (12°F), thawed at 6.5°C (44°F), and then returned to freezing conditions. Generally, repeated freezing and thawing can expose weakness in a watch, while moisture or condensation can build up during each cycle and compromise watch functions due to those weaknesses. The G-SHOCK DW5600UBB-1 military watch demonstrated no such issue, passing the MIL-STD-810 freeze/thaw test without showing signs of physical or visual damage. As shown in the image, the reverse LCD is still legible amidst the moisture that built up on the scratch-resistant mineral glass, and this mil-spec watch continued to function as designed.

During the blowing rain test, the DW5600UBB-1 endured sustained wind speeds of 40 MPH while pelted with water at the incredible rate of 4 inches of rain/hour. During the blast of blowing rain, the watch remained in full operation. This G-SHOCK tough military watch passed the test with the standardized response of "no physical or visual damage." With water resistance of 200 meters, Casio didn't expect anything less than success for the DW5600UBB-1 in simulated blowing rain.

The salt fog test is another punishing assessment of G-SHOCK durable design. A salt fog test assesses corrosion vulnerability, which can identify weaknesses from the corrosive capabilities of salt deposits in coastal and marine environments. The salt fog test is a simulation of the possible corrosion found in these environments:

• A ship or boat in rough water, when breaking waves throw fine droplets over decks and on equipment
• At the beach during strong onshore winds or storms, when surf and whitecaps generate airborne sea-salt aerosol
• During marine fog, drizzle, or overnight condensation near the coast, when salt particles already deposited on a surface can dissolveagain in moisture, creating a conductive saltwater film
• Near offshore platforms, naval bases, coastal airfields, and amphibious operations where equipment may be stored, transported, or operatedin exactly these salt-laden maritime conditions
• For any outdoor marine activity or excursion such as surfing, sailing, saltwater fishing, beach running, or kayaking, where one leaves awatch wet with seawater and then lets it dry repeatedly

Element labs tested the DW5600UBB-1 under MIL-STD-810G by exposing the military watch to a 95°F, roughly 5% salt-mist environment for two 24- hour cycles. Each exposure was followed by a 24-hour drying period, simulating the repeated wet-and-dry salt exposure that can occur in coastal and marine conditions. The watch remained powered and operational during testing, and Element labs reported no visible damage or corrosion after the full test.

Built to take on salt-sprayed shores, wave-pounded ship decks, and whatever else coastal and marine elements deliver, the DW5600UBB-1 military watch emerged from MIL-STD-810G salt fog testing with no visible corrosion or damage.

This achievement is made possible by over 40 years of expert G-SHOCK design and craftsmanship. The DW5600UBB-1 includes shock and 200m water resistance with easy-access timekeeping and sensor buttons that are themselves protected by the case design, allowing the DW5600UBB-1 to endure the elements as only a G-SHOCK military watch can do.

*Cross-section of the hollow case structure of the DW-5000C, the original G-SHOCK square and ancestor of the DW5600UBB-1.

• Pleiku, Vietnam (Plei Me Campaign, 1965) — about 2,400 feet
• Chosin Reservoir / Hagaru-ri, North Korea (1950) — roughly 4,000 feet
• Bagram Airfield, Afghanistan (2001–2021) — 4,895 feet
• Kabul, Afghanistan (2001–2021) —5,876 feet
• Shah-i-Kot Valley, Afghanistan (Operation Anaconda, March 2002) — valley floor about 8,500 feet