Which component is described as protecting the missile from debris and moisture?

• A. Acquisition indicators
• B. IR Window & Blow Out Disk
• C. Humidity indicator
• D. Rear sight reticles

Answer: (B)

The protection of the missile’s infrared seeker hinges on the IR window plus a blow-out disk. The IR window is a hard, transparent barrier that covers the infrared sensor, keeping out rain, dust, and other debris while still letting infrared energy reach the detector. The blow-out disk is a safety feature arranged with the window area to vent or relieve pressure and prevent moisture or contaminants from forcing their way into the seeker assembly; if intrusion or pressure occurs, the disk will fail in a controlled way to protect the sensitive electronics inside. Together, they shield the seeker from environmental hazards during storage, handling, and launch. The other options don’t provide this protective function: acquisition indicators are for target spotting, humidity indicators only signal moisture presence, and rear sight reticles are for aiming.