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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  3. Identification friend or foe - Wikipedia

    en.wikipedia.org/wiki/Identification_friend_or_foe

    Identification, friend or foe ( IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1]

  4. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    National Bike Month. National Military Appreciation Month. National Foster Care Month [ 27] National Guide Dog Month (2008, 2009) National Pet Month (United States) National Smile Month (United Kingdom, May and June) National Stroke Awareness Month. South Asian Heritage Month (Ontario, Canada) Zombie Awareness Month.

  5. Earliest known photograph of a US first lady acquired by ...

    www.aol.com/earliest-known-photograph-us-first...

    The process involves polishing a sheet of silver-plated copper and treating it with light-sensitive fumes before exposing it to a camera, and then drawing the latent image forth with mercury vapor ...

  6. List of awareness ribbons - Wikipedia

    en.wikipedia.org/wiki/List_of_awareness_ribbons

    List of awareness ribbons. merged Pink and blue ribbon Discuss Proposed since March 2024. This is a partial list of awareness ribbons. The meaning behind an awareness ribbon depends on its colors and pattern. Since many advocacy groups have adopted ribbons as symbols of support or awareness, ribbons, particularly those of a single color, some ...

  7. Twice-yearly shot proves successful at preventing HIV ... - AOL

    www.aol.com/twice-yearly-shot-proves-successful...

    The twice-yearly injection of the drug lenacapavir can provide total protection against HIV infections, demonstrating 100% efficacy in Phase 3 trial data released by drugmaker Gilead and published ...

  8. List of U.S. security clearance terms - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._security...

    Investigations. The following investigations are used in clearance determinations: [12] ANACI (Access National Agency Check with Inquiries) – Initial Confidential, Secret, L, LX; only used for civilian employees. NACLC (National Agency Check with Law and Credit) – Initial Confidential, Secret, L, LX; reinvestigations.

  9. Ronald Reagan Ballistic Missile Defense Test Site - Wikipedia

    en.wikipedia.org/wiki/Ronald_Reagan_Ballistic...

    The Ronald Reagan Ballistic Missile Defense Test Site, commonly referred to as the Reagan Test Site (formerly Kwajalein Missile Range ), is a missile test range in Marshall Islands ( Pacific Ocean ). It covers about 750,000 square miles (1,900,000 km 2) and includes rocket launch sites at the Kwajalein Atoll (on multiple islands), Wake Island ...