The US Army aims to give almost all of its ground combat units tiny drones which can spy on other forces from the sky.

The contract awarded is worth $39.6 million and has enriched the coffers of FLIR Systems, an Oregon, US-based firm which develops thermal imaging, surveillance, and navigation technologies.

FLIR has been tasked with providing the military with Black Hornet Personal Reconnaissance Systems (PRS), which are drones small enough to sit in the palm of your hand.

The drones, described as "highly capable nano-unmanned aerial vehicle (UAV) systems," measure only 6.6-inches across and weigh less than 33 grams.

The drones have a range of 1.24 miles at speeds of up to 13.35 mph and are able to fly for up to 25 minutes on a single charge.

In addition, the UAVs can take HD photos and provide live video feeds. Data sent to operators on the ground, equipped with a handheld ground control station (GCS) unit which communicates with the drone, is AES 256 encrypted.

According to FLIR, each Black Hornet can operate in temperatures ranging from -10c to 43c and can withstand wind gusts of up to 20 knots.

The Black Hornets will be given to US platoons and small units which require surveillance capabilities while on the ground.

FLIR says the first batch of drones, en route to forces now, is part of the Soldier Borne Sensor (SBS) Program which involves investment in both UAVs and ground control systems.

"With a camera in the air vehicle, soldiers will be able to see further and around obstacles that they previously wouldn't be able to see in near real time," the US Army says.

In the video below, you can see the Black Hornet take flight during SBS testing.

While the full details or order numbers of the contract are unknown, an order for 60 of the Black Hornets awarded in May 2018 was worth $2.6 million. 

The ultimate goal is to field at least one UAV and ground system for almost all of the 7,000 squads in the US Army.

In January, the Pentagon published a report documenting the United States' increasing domestic drone use. In 2018, 11 missions were conducted -- including during wildfire season and after Hurricane Florence -- as well as to respond to southern border support requests by the Army.