Support Equipment

IC-4008M Infantry Squad Radio

Also known as
  • IC-4008M
  • Icom IC-4008M
  • Icom Infantry Squad Radio
  • Intra Squad Radio
  • ISR
  • USMC IC-4008M

The Icom IC-4008M was a compact UHF handheld transceiver selected as the U.S. Marine Corps Intra Squad Radio for infantry-level voice coordination. Icom America described it as a military-frequency version of the IC-4008A, while Icom UK linked the Marine Corps model to the IC-446S/PMR446 family and reported completion of a 13,000-unit delivery in October 2000.

IC-4008M Infantry Squad Radio, UHF handheld infantry squad radio, Support Equipment
Image source: Icom UK Marines IC-4008M notice
Profile / Specs

Profile

Origin
Japan / United States
Built by
Icom Inc.
Built in
Japan
Type
UHF handheld infantry squad radio
Service note
2000s
Designer
Icom Inc.
Produced
Delivered October 2000
Number built
More than 13,000 units supplied for the U.S. military contract

Specifications

TAMCN
H23732G
NSN
5965-09-000-0008
Radio class
Portable UHF infantry squad transceiver
Channels
14 simplex channels
Frequency range
396.875-399.975 MHz
Mode
FM
Frequency stability
+/-1.7 kHz
Channel spacing
25 kHz
Frequency resolution
12.5 kHz
CTCSS tones
38 tones, 67.0-250.3 Hz
Output power
Less than 500 mW ERP
Power supply
Three AA alkaline cells or optional BP-202 Ni-Cd battery cell assembly
Battery life
Approximately 28 hours with three alkaline cells or 10 hours with optional BP-202
Weight
7.8 oz with three cells
Dimensions
2.313 x 1.031 x 7.125 in with antenna
Operating temperature
+14°F to 122°F
Sensitivity
Less than 0.2 uV at 12 dB SINAD
Audio output
More than 100 mW at 10% distortion with an 8 ohm load
Environmental rating
JIS-5 weather-resistant; brochure says it passed MIL SPEC 810 C, D and E inspection
Approximate range
Up to 2 miles in wide open spaces
Marine Corps Service Context

The IC-4008M record sits in the catalog as relationship-only support equipment because the available sources document procurement, Marine Corps inventory status, and infantry-squad communications use, but not direct use in a named armed conflict.

Inventory identity

The 2005 Marine Corps communications-equipment manual lists the radio as Intra Squad Radio (ISR), IC-4008M, with TAMCN H23732G and NSN 5965-09-000-0008.

Procurement ecosystem

A July 2000 Marine Corps Systems Command solicitation sought at least 13,000 headsets specifically for use with the ICOM IC-4008M radio.

Service boundary

The strongest sources support U.S. Marine Corps infantry-level communications and accessory procurement; they do not identify a conflict, deployment, or combat-side use row for this exact radio.

Variants

Icom described the IC-4008M as a military-frequency adaptation of closely related civil handheld-radio models rather than a wholly separate tactical-radio family.

VariantConfigurationDesignation notes
IC-4008AFRS parent model

Icom America said the Marine Corps IC-4008M was a special version of the IC-4008A with frequency changes for selected U.S. Marine Corps UHF channels.

Sources: Icom America archived IC-4008M release

IC-446SPMR446 related model

Icom UK described the Marine Corps radio as a modified IC-446S-derived PMR446 handheld with military frequency changes.

Sources: Icom UK Marines IC-4008M notice

Timeline

IC-4008M Infantry Squad Radio Key Events

  1. Icom America announces Marine Corps selection

    Icom America announced that the U.S. Marine Corps had selected the IC-4008M as a modified IC-4008A-based intrasquad radio for infantry-squad communications.

    Sources: Icom America archived IC-4008M release

  2. Marine Corps posts headset solicitation

    Marine Corps Systems Command solicited at least 13,000 Intra Squad Radio headsets for use with the ICOM IC-4008M radio.

    Sources: Commerce Business Daily ISR headset solicitation

  3. Initial radio deliveries completed

    Icom UK reported that all 13,000 IC-4008M units for the U.S. military contract were delivered during October 2000.

    Sources: Icom UK Marines IC-4008M notice

  4. Listed in Marine Corps communications manual

    A Marine Corps Systems Command technical manual listed the Intra Squad Radio, IC-4008M under TAMCN H23732G with its infantry-squad role and principal technical characteristics.

    Sources: USMC communications equipment manual

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Sources

Icom America archived IC-4008M releasePublisher: Icom America Inc. | Note: Supports the June 2000 Marine Corps selection announcement, IC-4008A-derived model context, IC-4008M designation, infantry-squad role, uniform-worn case, October 2000 delivery schedule, and non-public-sale statement. | Accessed: 2026-07-13Icom UK Marines IC-4008M noticePublisher: Icom (UK) Ltd | Note: Supports manufacturer, U.S. Marine Corps Infantry Squad Radio context, modified IC-446S relationship, delivery quantity, October 2000 delivery timing, and article image provenance. | Accessed: 2026-07-13Icom IC-4008M brochurePublisher: Icom America Inc. | Note: Supports IC-4008M specifications, U.S. Marine Corps transceiver description, weather resistance, battery, dimensions, channels, frequencies, frequency stability, CTCSS tones, current drain, audio output, sensitivity, and power details. | Accessed: 2026-07-13USMC communications equipment manualPublisher: United States Marine Corps | Note: Supports official Intra Squad Radio nomenclature, TAMCN H23732G, NSN, infantry-squad role, uniform-worn case, and principal technical characteristics in the December 2005 Marine Corps Systems Command manual. | Accessed: 2026-07-13Commerce Business Daily ISR headset solicitationPublisher: Commerce Business Daily | Note: Supports the July 2000 Marine Corps Systems Command solicitation for Intra Squad Radio headsets for use with the ICOM IC-4008M radio, including minimum quantity and delivery-destination context. | Accessed: 2026-07-13Icom America non-supported products listPublisher: Icom America Inc. | Note: Supports current discontinued or non-supported status for legacy Icom models including IC-4008M. | Accessed: 2026-07-13