US army awards Lockheed Martin $4.5 billion multi-year Patriot Missiles contract

On the same subject

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  June 17, 2019 | International, Other Defence

  Enabling Revolutionary Nondestructive Inspection Capability

  X-rays and gamma rays have a wide range of applications including scanning suspicious maritime shipping containers for illicit materials, industrial inspection of materials and processes, and medical diagnostic and therapeutic procedures. Current technologies, however, are not ideal. X-rays produce a continuum of energies that limit their inspection and diagnostic performance, and gamma rays can only be produced at specific energies unique to a given radioactive isotope. DARPA today announced its Gamma Ray Inspection Technology (GRIT) program. GRIT seeks novel approaches to achieve high-intensity, tunable, and narrow-bandwidth sources of gamma ray radiation in a compact, transportable form factor that would enable a wide range of national security, industrial, and medical applications. A Proposers Day webinar describing the goals of the program is scheduled for July 8, 2019. “What we're trying to do in GRIT is transform the use of x-rays and gamma rays,” said Mark Wrobel, program manager in DARPA's Defense Sciences Office. “Current sources of gamma rays, like Cobalt-60 or Cesium-137, are not very flexible. They require special licenses to possess and only emit gamma rays at very specific energies. What we desire is a source of very high-energy photons that we can tune to match the application we need. This ranges from more effective detection of illicit cargo, to a more informative medical x-ray.” GRIT aims to provide a source of tunable, pure x-rays and gamma rays from tens of keV (kilo-electron volts) up through over ten MeV (mega-electron volts). Currently, tunable and narrow bandwidth gamma ray sources only exist at highly specialized user facilities best suited for basic research and are not able to support broad practical applications. Shrinking these photon sources to a transportable system is a major goal and challenge of the GRIT program. GRIT technology could make possible a range of new inspection and diagnostic protocols. In medical and industrial radiography, for example, GRIT could enable revealing specific elemental and material content, such as calcium in bones or specific metals in cargo. A typical x-ray only shows differences in density in the object being inspected – whether a piece of luggage at an airport, or an individual at a doctor's office. If successful, a GRIT x-ray source could be tuned to detect and quantify the concentration of specific elements of interest, such as the amount of calcium in a given bone x-ray, enabling radiologists to actually see bone composition. Tuning energy between 10s of keV to over 100 hundred keV would allow detection of specific elements that might be of interest in characterizing novel materials and processes at micron scales. These techniques would be relevant to defense applications including non-destruction inspection of novel additively manufactured materials and alloys for their elemental composition. At energy levels in the MeV range, gamma ray photons have high enough energy to actually interact with the nuclei of atoms. Whereas x-rays work by interacting with the shells of atoms, GRIT would be able to stimulate the nucleus of an atom to bring about an effect called nuclear resonance fluorescence, a sort of “fingerprint” that is unique to each isotope on the periodic table. “With GRIT, you could probe and detect specific isotopes of interest by fine-tuning the photon energy to minimize background noise and take advantage of the nuclear resonance fluorescence phenomenon,” Wrobel said. “Those isotopes could be rare-earth elements of interest or special nuclear materials. To be able to definitively say, ‘Yes, there's highly enriched uranium in this object' and be able to characterize how much is present would be a significant leap forward over our current capabilities.” DARPA is seeking expertise in a range of technologies on the GRIT program including advanced accelerator technology, high-energy laser systems, novel control systems, and new x-ray and gamma ray detector technology. To register for the GRIT Proposers Day webinar, visit: https://go.usa.gov/xmh28. GRIT's focus on new, compact photon sources for inspection complements DARPA's Intense and Compact Neutron Sources (ICONS) program, which is developing compact neutron sources. The two technologies would work in tandem, yielding a very robust inspection capability. Caption: The Gamma Ray Inspection Technology (GRIT) program seeks tunable gamma ray sources for a host of national security, industrial, and medical applications. https://www.darpa.mil/news-events/2019-06-14

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  April 19, 2021 | International, Naval

  Le Mexique lance un appel d'offres pour des pièces de rechange pour les navires Army Pro-line et Spibo Rib

  Un appel d'offres international est lancé par la Direction générale des transports militaires du Secrétariat de la défense nationale (SEDENA) pour l'acquisition de pièces de rechange pour l'entretien des navires de l'armée. La note en espagnol se trouve ici https://www.infodefensa.com/latam/2021/04/15/noticia-sedena-requiere-refacciones-embarcaciones.html?utm_source=alerta&utm_medium=email&utm_campaign=enlaces_alertas et la traduction dans le PDF ci-joint.

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  October 21, 2020 | International, Land

  MPF: Light Tank Competitors BAE & GD Head For Soldier Tests

  BAE and General Dynamics are vying to build 504 Mobile Protected Firepower vehicles to support light infantry units, especially in places the massive M1 Abrams cannot go. SYDNEY J. FREEDBERG JR. WASHINGTON: After 24 years without a light tank in Army service, soldiers will climb aboard brand-new Mobile Protected Firepower prototypes this January. “It's not just PowerPoint” anymore, Maj. Gen. Bryan Cummings, the Army's Program Executive Officer for Ground Combat Systems (PEO-GCS), told me in an interview. “On Jan. 4th, we will have ... vehicles arriving at Fort Bragg.” Army experts have already started safety testing on prototype MPF vehicles, officials told me. Actual combat soldiers will start training on two platoons of prototypes in January – four MPFs from BAE, four from rival General Dynamics – with field tests scheduled to begin in April. A formal Limited User Test will start in August or September, with the Army choosing the winning design in 2022 and the first operational unit of MPF entering active service in 2025. A General Dynamics spokesperson told me they've already delivered five MPF prototypes to the Army, with two more in final checkouts and another five being built for delivery by the end of the year. BAE Systems is also building 12 prototypes, but they declined to say whether they'd delivered vehicles yet or not. While the Army can't comment on either contractor while the competition is ongoing, Cummings said, “both are on track to meet the major milestones” – despite the disruptions of COVID-19. After three months of training, the troops will start what's being called the Soldier Vehicle Assessment (SVA): four to five months of intensive field testing, including force-on-force wargames. It's all part of the Army's new emphasis on getting real soldiers' feedback on new weapons early and often. “The soldiers actually get to drive the vehicles around, shoot them, train with them,” BAE business developer James Miller told me. “Their feedback [is] likely to be the most critical factor ... in the decision the Army's going to make about who wins this contract.” The soldier assessment isn't just testing out the vehicles, however, Cummings told me: It's also a test of the Army. Specifically, how can light infantry brigades, which today have few vehicles or mechanics, sustain and operate a 20-plus-ton tank? The crucial distinction: MPF is not going to the Army's heavy brigades, which have lots of support troops and specialized equipment to take care of tracked armored vehicles. Instead, 14 MPFs per brigade will go to airborne and other light infantry units, which haven't had tracked armor since the M551 Sheridan was retired and its replacement cancelled in 1990s. Now, MPF won't be as fuel-hungry or maintenance-intensive as the massive M1 Abrams, America's mainstay main battle tank. Even with add-on armor kits for high-threat deployments, it'll be less than half as heavy as the M1. That's because MPF isn't meant to take on enemy tanks, at least not modern ones. Instead, it's designed to be light enough to deploy rapidly by air, simple enough to sustain at the end of a long and tenuous supply line, but potent enough to take on enemy light armored vehicles, bunkers, dug-in machineguns, and the like. That's a tricky balance to strike. In fact, the Army has never found a light tank it really liked despite decades of trying. Only six M22 Locusts actually fought in World War II, the M41 Walker Bulldog was too heavy for airborne units, the M551 Sheridan was plagued by technical problems throughout its service from Vietnam to Panama, the M8 Armored Gun System and the Future Combat System were both cancelled. So how do BAE and General Dynamics plan to square this circle? General Dynamics emphasized lethality in their interview with me. Their Lima tank plant builds the M1 Abrams, and while the MPF is smaller – though the company didn't divulge details, GD's version reportedly has a 105mm cannon, compared to the Abrams' 120mm – it will have the same fire controls and electronics as the latest model of its big brother. “If you sat in a Mobile Protected Firepower turret, you would think you were sitting in a [M1] SEPV3 turret,” a GD spokesperson told me. “It's all the same displays, architectures, power distribution, etc.” GD's design evolved from their Griffin demonstrators, prominently displayed for several years at AUSA annual meetings. It's got automotive components derived from the ASCOD/Ajax family widely used in Europe and an 800 horsepower engine. GD didn't tell me how much their vehicle weighed, but, depending on the armor package installed, the demonstrators ranged from 28 tons to 50 tons. Those figures would give horsepower/weight ratios ranging from 28 hp/ton, better than any model of the Abrams, to 16, which would make MPF much more sluggish. BAE, by contrast, emphasized their design's compactness and ease of maintenance – considerations as critical as firepower for a light infantry unit. BAE actually built the M8 AGS cancelled in the '90s drawdown, and while they've thoroughly overhauled that design for MPS with a new engine, new electronics, and underbody blast-proofing against roadside bombs, they've tried to preserve its airborne-friendly qualities. “The old M8 fit inside a C-130; in fact, it was air droppable,” Miller told me. “There's no requirement for that in the current MPF program, but we decided to stick with that as a design constraint: [Our MPF can] fit inside a C-130; we can do three on a C-17.” BAE's engine is less potent than GD's, with only 550 horsepower. With the base configuration coming in at under 30 tons, that equates to over 18 hp/ton, with heavier armor packages reducing performance from there. But the big selling point of the engine is ease of access, Miller argued. Engine maintenance on a tank requires a crane and partially disassembling the armor, but a mechanic can slide the BAE MPF's engine in and out of the chassis with a hand crank. If the MPF breaks down or gets stuck, it can be towed away by a truck, without requiring a special heavy recovery vehicle as an M1 does. “The infantry brigades are light. They don't have long logistics tails. They don't have a ton of mechanics and recovery vehicles,” Miller emphasized. “The vehicle has to be as mobile as them and fit inside their organization.” The Army estimates the life-cycle cost of MPF, from development to procurement to maintenance and retirement, at $16 billion. Whichever vehicle wins the Army contract will have an edge in sales worldwide – including, potentially, to the Marine Corps, which is retiring its M1s as too heavy for modern amphibious warfare. https://breakingdefense.com/2020/10/mpf-light-tank-competitors-bae-gd-head-for-soldier-tests/